* Replace OpenSearch license header with Wazuh's AGPLv3 license
* Apply Wazuh's AGPLv3 license header to source code
* Replace OpenSearch contributors license header on NOTICE, build.gradle and tests files
* Update AGPL header format to the recommended by the license
* Restore copyright mention on NOTICE.txt
* Add precommit hook definition to perform basic formatting using spotless on indexer plugins
* Add formatter configuration file for spotless tool
* Update command-manager's build.gradle to use the spotless tool
* Update spotless implementation on setup plugin
- Order build.gradle blocks
- Add spotless plugin to build.gradle
- Update formatting.gradle for both plugins
* Add formatter config for spotless on setup plugin
* Add license header validation on java files
- Add license-header.txt file with the expected content of the headers
- Update formatting.gradle on both plugins to validate the license header
- Rename buildSrc directory to formatter
* Update formatter settings
* Implement custom import order based on wazuh-indexer defined convention
* Apply format-related changes requested by spotless formatter
* Initialize a gradle base project to handle generic processes for the subprojects
- Move spotless-related configuration to main project directory
- Add pre-commit hook script to run spotlessCheck
- Add block on build.gradle to automatically apply pre-commit script into local .git dir
- Remove duplicated spotless-related code
* Apply spotless formatting to command-manager classes
