[DOC] Add documentation for data-prepper lambda pluggin - streaming support

[mananrajotia]

What do you want to do?

Add documentation for the streaming support feature addition which was requested as part of opensearch-project/data-prepper#5973. PR for it is being raised simultaneously.

• [N] Request a change to existing documentation
• [Y] Add new documentation
• [N] Report a technical problem with the documentation
• [N] Other

Tell us about your request. Provide a summary of the request.
Add documentation for the streaming support feature addition which was requested as part of opensearch-project/data-prepper#5973. PR for it is being raised simultaneously.

Version: List the OpenSearch version to which this issue applies, e.g. 2.14, 2.12--2.14, or all.

What other resources are available? Provide links to related issues, POCs, steps for testing, etc.
opensearch-project/data-prepper#5973

[a2105z]

Hi @mananrajotia - I am new to open source - was wondering if I could help you make this documentation. Please let me know.