[Backport 3.3] [Agentic Search]Add extract JSON processor in Query Planning Tool

[opensearch-trigger-bot]

Backport d206ffd from #4356

[codecov]

Codecov Report

❌ Patch coverage is 67.44186% with 14 lines in your changes missing coverage. Please review.
✅ Project coverage is 80.07%. Comparing base (0bfaf7b) to head (69ee27b).
⚠️ Report is 3 commits behind head on 3.3.

Files with missing lines	Patch %	Lines
...ch/ml/engine/processor/MLExtractJsonProcessor.java	44.00%	13 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##                3.3    #4363      +/-   ##
============================================
- Coverage     80.08%   80.07%   -0.01%     
- Complexity    10191    10192       +1     
============================================
  Files           855      855              
  Lines         44373    44404      +31     
  Branches       5135     5136       +1     
============================================
+ Hits          35536    35557      +21     
- Misses         6671     6681      +10     
  Partials       2166     2166              

Flag	Coverage Δ
ml-commons	80.07% <67.44%> (-0.01%)	⬇️

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