feat: [merchantapi] new module for merchantapi inventories (#9891)

```
python3.9 generation/new_client/new-client.py generate   
--api_shortname=merchantapi 
--proto-path=google/shopping/merchant/inventories 
--name-pretty="Merchant API" 
--product-docs="https://developers.google.com/merchant/api" 
--api-description="Programmatically manage your Merchant Center accounts." 
--distribution-name="com.google.shopping:google-shopping-merchant-inventories"
```

java-merchantapi/.OwlBot.yaml

@@ -0,0 +1,36 @@
+# Copyright 2022 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+
+deep-remove-regex:
+- "/java-merchantapi/grpc-google-.*/src"
+- "/java-merchantapi/proto-google-.*/src"
+- "/java-merchantapi/google-.*/src"
+- "/java-merchantapi/samples/snippets/generated"
+
+deep-preserve-regex:
+- "/java-merchantapi/google-.*/src/test/java/com/google/cloud/.*/v.*/it/IT.*Test.java"
+
+deep-copy-regex:
+- source: "/google/shopping/merchant/inventories/(v.*)/.*-java/proto-google-.*/src"
+  dest: "/owl-bot-staging/java-merchantapi/$1/proto-google-shopping-merchant-inventories-$1/src"
+- source: "/google/shopping/merchant/inventories/(v.*)/.*-java/grpc-google-.*/src"
+  dest: "/owl-bot-staging/java-merchantapi/$1/grpc-google-shopping-merchant-inventories-$1/src"
+- source: "/google/shopping/merchant/inventories/(v.*)/.*-java/gapic-google-.*/src"
+  dest: "/owl-bot-staging/java-merchantapi/$1/google-shopping-merchant-inventories/src"
+- source: "/google/shopping/merchant/inventories/(v.*)/.*-java/samples/snippets/generated"
+  dest: "/owl-bot-staging/java-merchantapi/$1/samples/snippets/generated"
+
+
+api-name: merchantapi

java-merchantapi/.repo-metadata.json

@@ -0,0 +1,16 @@
+{
+  "api_shortname": "merchantapi",
+  "name_pretty": "Merchant API",
+  "product_documentation": "https://developers.google.com/merchant/api",
+  "api_description": "Programmatically manage your Merchant Center accounts.",
+  "client_documentation": "https://cloud.google.com/java/docs/reference/google-shopping-merchant-inventories/latest/overview",
+  "release_level": "preview",
+  "transport": "grpc",
+  "language": "java",
+  "repo": "googleapis/java-merchantapi",
+  "repo_short": "java-merchantapi",
+  "distribution_name": "com.google.shopping:google-shopping-merchant-inventories",
+  "api_id": "merchantapi.googleapis.com",
+  "library_type": "GAPIC_AUTO",
+  "requires_billing": true
+}

java-merchantapi/README.md

@@ -0,0 +1,225 @@
+# Google Merchant API Client for Java
+
+Java idiomatic client for [Merchant API][product-docs].
+
+[![Maven][maven-version-image]][maven-version-link]
+![Stability][stability-image]
+
+- [Product Documentation][product-docs]
+- [Client Library Documentation][javadocs]
+
+> Note: This client is a work-in-progress, and may occasionally
+> make backwards-incompatible changes.
+
+
+## Quickstart
+
+
+If you are using Maven with [BOM][libraries-bom], add this to your pom.xml file:
+
+```xml
+<dependencyManagement>
+  <dependencies>
+    <dependency>
+      <groupId>com.google.cloud</groupId>
+      <artifactId>libraries-bom</artifactId>
+      <version>26.23.0</version>
+      <type>pom</type>
+      <scope>import</scope>
+    </dependency>
+  </dependencies>
+</dependencyManagement>
+
+<dependencies>
+  <dependency>
+    <groupId>com.google.shopping</groupId>
+    <artifactId>google-shopping-merchant-inventories</artifactId>
+  </dependency>
+```
+
+If you are using Maven without the BOM, add this to your dependencies:
+
+<!-- {x-version-update-start:google-shopping-merchant-inventories:released} -->
+
+```xml
+<dependency>
+  <groupId>com.google.shopping</groupId>
+  <artifactId>google-shopping-merchant-inventories</artifactId>
+  <version>0.0.0</version>
+</dependency>
+```
+
+If you are using Gradle without BOM, add this to your dependencies:
+
+```Groovy
+implementation 'com.google.shopping:google-shopping-merchant-inventories:0.0.0'
+```
+
+If you are using SBT, add this to your dependencies:
+
+```Scala
+libraryDependencies += "com.google.shopping" % "google-shopping-merchant-inventories" % "0.0.0"
+```
+<!-- {x-version-update-end} -->
+
+## Authentication
+
+See the [Authentication][authentication] section in the base directory's README.
+
+## Authorization
+
+The client application making API calls must be granted [authorization scopes][auth-scopes] required for the desired Merchant API APIs, and the authenticated principal must have the [IAM role(s)][predefined-iam-roles] required to access GCP resources using the Merchant API API calls.
+
+## Getting Started
+
+### Prerequisites
+
+You will need a [Google Cloud Platform Console][developer-console] project with the Merchant API [API enabled][enable-api].
+You will need to [enable billing][enable-billing] to use Google Merchant API.
+[Follow these instructions][create-project] to get your project set up. You will also need to set up the local development environment by
+[installing the Google Cloud Command Line Interface][cloud-cli] and running the following commands in command line:
+`gcloud auth login` and `gcloud config set project [YOUR PROJECT ID]`.
+
+### Installation and setup
+
+You'll need to obtain the `google-shopping-merchant-inventories` library.  See the [Quickstart](#quickstart) section
+to add `google-shopping-merchant-inventories` as a dependency in your code.
+
+## About Merchant API
+
+
+[Merchant API][product-docs] Programmatically manage your Merchant Center accounts.
+
+See the [Merchant API client library docs][javadocs] to learn how to
+use this Merchant API Client Library.
+
+
+
+
+
+
+## Troubleshooting
+
+To get help, follow the instructions in the [shared Troubleshooting document][troubleshooting].
+
+## Transport
+
+Merchant API uses gRPC for the transport layer.
+
+## Supported Java Versions
+
+Java 8 or above is required for using this client.
+
+Google's Java client libraries,
+[Google Cloud Client Libraries][cloudlibs]
+and
+[Google Cloud API Libraries][apilibs],
+follow the
+[Oracle Java SE support roadmap][oracle]
+(see the Oracle Java SE Product Releases section).
+
+### For new development
+
+In general, new feature development occurs with support for the lowest Java
+LTS version covered by  Oracle's Premier Support (which typically lasts 5 years
+from initial General Availability). If the minimum required JVM for a given
+library is changed, it is accompanied by a [semver][semver] major release.
+
+Java 11 and (in September 2021) Java 17 are the best choices for new
+development.
+
+### Keeping production systems current
+
+Google tests its client libraries with all current LTS versions covered by
+Oracle's Extended Support (which typically lasts 8 years from initial
+General Availability).
+
+#### Legacy support
+
+Google's client libraries support legacy versions of Java runtimes with long
+term stable libraries that don't receive feature updates on a best efforts basis
+as it may not be possible to backport all patches.
+
+Google provides updates on a best efforts basis to apps that continue to use
+Java 7, though apps might need to upgrade to current versions of the library
+that supports their JVM.
+
+#### Where to find specific information
+
+The latest versions and the supported Java versions are identified on
+the individual GitHub repository `github.com/GoogleAPIs/java-SERVICENAME`
+and on [google-cloud-java][g-c-j].
+
+## Versioning
+
+
+This library follows [Semantic Versioning](http://semver.org/).
+
+
+It is currently in major version zero (``0.y.z``), which means that anything may change at any time
+and the public API should not be considered stable.
+
+
+## Contributing
+
+
+Contributions to this library are always welcome and highly encouraged.
+
+See [CONTRIBUTING][contributing] for more information how to get started.
+
+Please note that this project is released with a Contributor Code of Conduct. By participating in
+this project you agree to abide by its terms. See [Code of Conduct][code-of-conduct] for more
+information.
+
+
+## License
+
+Apache 2.0 - See [LICENSE][license] for more information.
+
+## CI Status
+
+Java Version | Status
+------------ | ------
+Java 8 | [![Kokoro CI][kokoro-badge-image-2]][kokoro-badge-link-2]
+Java 8 OSX | [![Kokoro CI][kokoro-badge-image-3]][kokoro-badge-link-3]
+Java 8 Windows | [![Kokoro CI][kokoro-badge-image-4]][kokoro-badge-link-4]
+Java 11 | [![Kokoro CI][kokoro-badge-image-5]][kokoro-badge-link-5]
+
+Java is a registered trademark of Oracle and/or its affiliates.
+
+[product-docs]: https://developers.google.com/merchant/api
+[javadocs]: https://cloud.google.com/java/docs/reference/google-shopping-merchant-inventories/latest/overview
+[kokoro-badge-image-1]: http://storage.googleapis.com/cloud-devrel-public/java/badges/java-merchantapi/java7.svg
+[kokoro-badge-link-1]: http://storage.googleapis.com/cloud-devrel-public/java/badges/java-merchantapi/java7.html
+[kokoro-badge-image-2]: http://storage.googleapis.com/cloud-devrel-public/java/badges/java-merchantapi/java8.svg
+[kokoro-badge-link-2]: http://storage.googleapis.com/cloud-devrel-public/java/badges/java-merchantapi/java8.html
+[kokoro-badge-image-3]: http://storage.googleapis.com/cloud-devrel-public/java/badges/java-merchantapi/java8-osx.svg
+[kokoro-badge-link-3]: http://storage.googleapis.com/cloud-devrel-public/java/badges/java-merchantapi/java8-osx.html
+[kokoro-badge-image-4]: http://storage.googleapis.com/cloud-devrel-public/java/badges/java-merchantapi/java8-win.svg
+[kokoro-badge-link-4]: http://storage.googleapis.com/cloud-devrel-public/java/badges/java-merchantapi/java8-win.html
+[kokoro-badge-image-5]: http://storage.googleapis.com/cloud-devrel-public/java/badges/java-merchantapi/java11.svg
+[kokoro-badge-link-5]: http://storage.googleapis.com/cloud-devrel-public/java/badges/java-merchantapi/java11.html
+[stability-image]: https://img.shields.io/badge/stability-preview-yellow
+[maven-version-image]: https://img.shields.io/maven-central/v/com.google.shopping/google-shopping-merchant-inventories.svg
+[maven-version-link]: https://central.sonatype.com/artifact/com.google.shopping/google-shopping-merchant-inventories/0.0.0
+[authentication]: https://github.com/googleapis/google-cloud-java#authentication
+[auth-scopes]: https://developers.google.com/identity/protocols/oauth2/scopes
+[predefined-iam-roles]: https://cloud.google.com/iam/docs/understanding-roles#predefined_roles
+[iam-policy]: https://cloud.google.com/iam/docs/overview#cloud-iam-policy
+[developer-console]: https://console.developers.google.com/
+[create-project]: https://cloud.google.com/resource-manager/docs/creating-managing-projects
+[cloud-cli]: https://cloud.google.com/cli
+[troubleshooting]: https://github.com/googleapis/google-cloud-java/blob/main/TROUBLESHOOTING.md
+[contributing]: https://github.com/googleapis/java-merchantapi/blob/main/CONTRIBUTING.md
+[code-of-conduct]: https://github.com/googleapis/java-merchantapi/blob/main/CODE_OF_CONDUCT.md#contributor-code-of-conduct
+[license]: https://github.com/googleapis/java-merchantapi/blob/main/LICENSE
+[enable-billing]: https://cloud.google.com/apis/docs/getting-started#enabling_billing
+[enable-api]: https://console.cloud.google.com/flows/enableapi?apiid=merchantapi.googleapis.com
+[libraries-bom]: https://github.com/GoogleCloudPlatform/cloud-opensource-java/wiki/The-Google-Cloud-Platform-Libraries-BOM
+[shell_img]: https://gstatic.com/cloudssh/images/open-btn.png
+
+[semver]: https://semver.org/
+[cloudlibs]: https://cloud.google.com/apis/docs/client-libraries-explained
+[apilibs]: https://cloud.google.com/apis/docs/client-libraries-explained#google_api_client_libraries
+[oracle]: https://www.oracle.com/java/technologies/java-se-support-roadmap.html
+[g-c-j]: http://github.com/googleapis/google-cloud-java

java-merchantapi/google-shopping-merchant-inventories-bom/pom.xml

@@ -0,0 +1,44 @@
+<?xml version='1.0' encoding='UTF-8'?>
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+  <modelVersion>4.0.0</modelVersion>
+  <groupId>com.google.shopping</groupId>
+  <artifactId>google-shopping-merchant-inventories-bom</artifactId>
+  <version>0.0.1-SNAPSHOT</version><!-- {x-version-update:google-shopping-merchant-inventories:current} -->
+  <packaging>pom</packaging>
+
+  <parent>
+    <groupId>com.google.cloud</groupId>
+    <artifactId>google-cloud-pom-parent</artifactId>
+    <version>1.19.0-SNAPSHOT</version><!-- {x-version-update:google-cloud-java:current} -->
+    <relativePath>../../google-cloud-pom-parent/pom.xml</relativePath>
+  </parent>
+
+  <name>Google Merchant API BOM</name>
+  <description>
+    BOM for Merchant API
+  </description>
+
+  <properties>
+    <maven.antrun.skip>true</maven.antrun.skip>
+  </properties>
+
+  <dependencyManagement>
+    <dependencies>
+      <dependency>
+        <groupId>com.google.shopping</groupId>
+        <artifactId>google-shopping-merchant-inventories</artifactId>
+        <version>0.0.1-SNAPSHOT</version><!-- {x-version-update:google-shopping-merchant-inventories:current} -->
+      </dependency>
+      <dependency>
+        <groupId>com.google.shopping.api.grpc</groupId>
+        <artifactId>grpc-google-shopping-merchant-inventories-v1beta</artifactId>
+        <version>0.0.1-SNAPSHOT</version><!-- {x-version-update:grpc-google-shopping-merchant-inventories-v1beta:current} -->
+      </dependency>
+      <dependency>
+        <groupId>com.google.shopping.api.grpc</groupId>
+        <artifactId>proto-google-shopping-merchant-inventories-v1beta</artifactId>
+        <version>0.0.1-SNAPSHOT</version><!-- {x-version-update:proto-google-shopping-merchant-inventories-v1beta:current} -->
+      </dependency>
+    </dependencies>
+  </dependencyManagement>
+</project>