PPL/SQL in search API [SQL Plugin Changes]

[vmmusings]

Description

[Describe what this change achieves]

Issues Resolved

[List any issues this PR will resolve]

Check List

• New functionality includes testing.
  • All tests pass, including unit test, integration test and doctest
• New functionality has been documented.
  • New functionality has javadoc added
  • New functionality has user manual doc added
• Commits are signed per the DCO using --signoff

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.41%. Comparing base (fcc4be3) to head (e390c32).

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #2531   +/-   ##
=========================================
  Coverage     95.41%   95.41%           
  Complexity     5027     5027           
=========================================
  Files           483      483           
  Lines         14016    14016           
  Branches        944      944           
=========================================
  Hits          13374    13374           
  Misses          621      621           
  Partials         21       21           

Flag	Coverage Δ
sql-engine	95.41% <ø> (ø)

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[vmmusings]

Closing and reasons can be seen here: opensearch-project/OpenSearch#12434