[Backport 2.x] agent meta classes in common

[opensearch-trigger-bot]

Backport 3949ef9 from #1757

[codecov]

Codecov Report

Attention: 42 lines in your changes are missing coverage. Please review.

Comparison is base (a881bc7) 82.40% compared to head (dc77c4d) 82.47%.

Files	Patch %	Lines
...n/java/org/opensearch/ml/common/agent/MLAgent.java	88.73%	2 Missing and 14 partials ⚠️
...ava/org/opensearch/ml/common/agent/MLToolSpec.java	86.95%	2 Missing and 7 partials ⚠️
...ain/java/org/opensearch/ml/common/CommonValue.java	0.00%	6 Missing ⚠️
...a/org/opensearch/ml/common/agent/MLMemorySpec.java	87.23%	2 Missing and 4 partials ⚠️
...n/java/org/opensearch/ml/common/agent/LLMSpec.java	88.37%	1 Missing and 4 partials ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##                2.x    #1759      +/-   ##
============================================
+ Coverage     82.40%   82.47%   +0.06%     
- Complexity     4467     4529      +62     
============================================
  Files           425      429       +4     
  Lines         17764    18071     +307     
  Branches       1883     1931      +48     
============================================
+ Hits          14639    14904     +265     
- Misses         2360     2373      +13     
- Partials        765      794      +29     

Flag	Coverage Δ
ml-commons	82.47% <86.31%> (+0.06%)	⬆️

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