[KYUUBI #3067][DOC] Add Flink Table Store connector doc for Spark SQL…

… Engine

### _Why are the changes needed?_

Add Flink Table Store connector doc for Spark SQL Engine

### _How was this patch tested?_
- [ ] Add some test cases that check the changes thoroughly including negative and positive cases if possible

- [ ] Add screenshots for manual tests if appropriate

- [ ] [Run test](https://kyuubi.apache.org/docs/latest/develop_tools/testing.html#running-tests) locally before make a pull request

Closes #3151 from huage1994/3067.

Closes #3067

b2bc67d [guanhua.lgh] [KYUUBI #3067][DOC] Add Flink Table Store connector doc for Spark SQL Engine

Authored-by: guanhua.lgh <guanhua.lgh@alibaba-inc.com>
Signed-off-by: Kent Yao <yao@apache.org>

docs/connector/spark/flink_table_store.rst

@@ -0,0 +1,90 @@
+.. Licensed to the Apache Software Foundation (ASF) under one or more
+   contributor license agreements.  See the NOTICE file distributed with
+   this work for additional information regarding copyright ownership.
+   The ASF licenses this file to You 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.
+
+`Flink Table Store`_
+==========
+
+Flink Table Store is a unified storage to build dynamic tables for both streaming and batch processing in Flink,
+supporting high-speed data ingestion and timely data query.
+
+.. tip::
+   This article assumes that you have mastered the basic knowledge and operation of `Flink Table Store`_.
+   For the knowledge about Flink Table Store not mentioned in this article,
+   you can obtain it from its `Official Documentation`_.
+
+By using kyuubi, we can run SQL queries towards Flink Table Store which is more
+convenient, easy to understand, and easy to expand than directly using
+spark to manipulate Flink Table Store.
+
+Flink Table Store Integration
+-------------------
+
+To enable the integration of kyuubi spark sql engine and Flink Table Store through
+Apache Spark Datasource V2 and Catalog APIs, you need to:
+
+- Referencing the Flink Table Store :ref:`dependencies`
+- Setting the spark extension and catalog :ref:`configurations`
+
+.. _dependencies:
+
+Dependencies
+************
+
+The **classpath** of kyuubi spark sql engine with Flink Table Store supported consists of
+
+1. kyuubi-spark-sql-engine-|release|.jar, the engine jar deployed with Kyuubi distributions
+2. a copy of spark distribution
+3. flink-table-store-spark-<version>.jar (example: flink-table-store-spark-0.2.jar), which can be found in the `Maven Central`_
+
+In order to make the Flink Table Store packages visible for the runtime classpath of engines, we can use one of these methods:
+
+1. Put the Flink Table Store packages into ``$SPARK_HOME/jars`` directly
+2. Set ``spark.jars=/path/to/flink-table-store-spark``
+
+.. warning::
+   Please mind the compatibility of different Flink Table Store and Spark versions, which can be confirmed on the page of `Flink Table Store multi engine support`_.
+
+.. _configurations:
+
+Configurations
+**************
+
+To activate functionality of Flink Table Store, we can set the following configurations:
+
+.. code-block:: properties
+
+   spark.sql.catalog.tablestore=org.apache.flink.table.store.spark.SparkCatalog
+   spark.sql.catalog.tablestore.warehouse=file:/tmp/warehouse
+
+Flink Table Store Operations
+------------------
+
+Flink Table Store supports reading table store tables through Spark.
+A common scenario is to write data with Flink and read data with Spark.
+You can follow this document `Flink Table Store Quick Start`_  to write data to a table store table
+and then use kyuubi spark sql engine to query the table with the following SQL ``SELECT`` statement.
+
+
+.. code-block:: sql
+
+   select * from table_store.default.word_count;
+
+
+
+.. _Flink Table Store: https://flink.apache.org/
+.. _Flink Table Store Quick Start: https://nightlies.apache.org/flink/flink-table-store-docs-master/docs/try-table-store/quick-start/
+.. _Official Documentation: https://nightlies.apache.org/flink/flink-table-store-docs-master/
+.. _Maven Central: https://mvnrepository.com/artifact/org.apache.flink
+.. _Flink Table Store multi engine support: https://nightlies.apache.org/flink/flink-table-store-docs-master/docs/engines/overview/

docs/connector/spark/index.rst

@@ -23,7 +23,7 @@ By default, it provides accessibility to hive warehouses with various file forma
 supported, such as parquet, orc, json, etc.
 
 Also，it can easily integrate with other third-party libraries, such as Hudi,
-Iceberg, Delta Lake, Kudu, HBase，Cassandra, etc.
+Iceberg, Delta Lake, Kudu, Flink Table Store, HBase，Cassandra, etc.
 
 We also provide sample data sources like TDC-DS, TPC-H for testing and benchmarking
 purpose.
@@ -36,6 +36,7 @@ purpose.
     hudi
     iceberg
     kudu
+    flink_table_store
     tispark
     tpcds
     tpch