[Backport 2.x] Support datastreams as an AuditLog Sink

[opensearch-trigger-bot]

Backport 9c5e32a from #4257.

[codecov]

Codecov Report

Attention: Patch coverage is 84.26966% with 14 lines in your changes missing coverage. Please review.

Project coverage is 65.45%. Comparing base (f353b0e) to head (4662e25).
Report is 1 commits behind head on 2.x.

Files with missing lines	Patch %	Lines
...uditlog/sink/InternalOpenSearchDataStreamSink.java	83.67%	6 Missing and 2 partials ⚠️
.../auditlog/sink/AbstractInternalOpenSearchSink.java	76.00%	4 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              2.x    #4756      +/-   ##
==========================================
+ Coverage   65.38%   65.45%   +0.06%     
==========================================
  Files         317      319       +2     
  Lines       22182    22250      +68     
  Branches     3584     3591       +7     
==========================================
+ Hits        14504    14564      +60     
- Misses       5881     5885       +4     
- Partials     1797     1801       +4     

Files with missing lines	Coverage Δ
.../opensearch/security/OpenSearchSecurityPlugin.java	84.86% <100.00%> (+0.20%)	⬆️
...security/auditlog/sink/InternalOpenSearchSink.java	100.00% <100.00%> (+16.66%)	⬆️
...pensearch/security/auditlog/sink/SinkProvider.java	80.89% <100.00%> (+0.43%)	⬆️
...g/opensearch/security/support/ConfigConstants.java	95.23% <ø> (ø)
.../auditlog/sink/AbstractInternalOpenSearchSink.java	76.00% <76.00%> (ø)
...uditlog/sink/InternalOpenSearchDataStreamSink.java	83.67% <83.67%> (ø)

... and 6 files with indirect coverage changes