[Meta] Refactoring data source plugin to support add-on authentication method with plug-in module

[bandinib-amzn]

This is meta tracking issue for Refactoring data source plugin to support add-on authentication method with plug-in module.

Tasks:

• [X] Modify data_source and data_source_management plugin to register authentication method from plugin. PR for above task: https://github.com/opensearch-project/OpenSearch-Dashboards/pull/5851/

• [X] Refactoring client and legacy client to use authentication registry.
  PR for above task: https://github.com/opensearch-project/OpenSearch-Dashboards/pull/5881

• [ ] Refactoring create and edit form to use authentication registry.

• [X] https://github.com/opensearch-project/opensearch-js/issues/696

• [ ] Handle client pooling mechanism for add-on authentication method.

• [ ] Add child client support for AWS SigV4 in legacy client.

[bandinib-amzn]

@xinruiba Can you please help on Refactoring create and edit form to use authentication registry? thanks!

[xinruiba]

@bandinib-amzn Sure, happy to work on it.

[xinruiba]

@bandinib-amzn, we can also mark "Refactoring create and edit form to use authentication registry." as complete. Thanks