[BUG] Configure project name for gradle subproject in plugin/ folder.

[prudhvigodithi]

What is the bug?
Add settings.gradle file and configure the project name as opensearch-sql in plugin/ folder.

What is the expected behavior?
To have a project name for gradle project residing inside the plugin/ folder https://github.com/opensearch-project/sql/tree/main/plugin

Do you have any additional context?
Without the project name the plugin zips being published with artifactID as plugin https://aws.oss.sonatype.org/content/repositories/snapshots/org/opensearch/plugin/plugin/, this does not add a proper naming convention and does not represent as sql plugin zip.

[prudhvigodithi]

With recent PR merge #592 to publish the plugin zips to maven , the plugins are being published but with unknown name.
Maven coordinates

<dependency>
  <groupId>org.opensearch.plugin</groupId>
  <artifactId>plugin</artifactId>
  <version>2.1.0.0-SNAPSHOT</version>
  <type>zip</type>
</dependency>

Please consider adding the project name for the gradle project inside the plugin/ folder.
Related issue: #592
@anirudha @joshuali925 @bbarani