Sop based agent

[xinyual]

Description

The PR to add sop based agent

Related Issues

Resolves #[Issue number to be closed when this PR is merged]

Check List

• New functionality includes testing.
• New functionality has been documented.
• API changes companion pull request created.
• Commits are signed per the DCO using --signoff.
• Public documentation issue/PR created.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
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[codecov]

Codecov Report

Attention: Patch coverage is 70.23411% with 89 lines in your changes missing coverage. Please review.

Project coverage is 80.31%. Comparing base (a67b4da) to head (6fef2f9).
Report is 21 commits behind head on main.

Files with missing lines	Patch %	Lines
...engine/algorithms/agent/MLSopBasedAgentRunner.java	79.64%	25 Missing and 21 partials ⚠️
.../opensearch/ml/engine/tools/ClusterHealthTool.java	0.00%	41 Missing ⚠️
...ch/ml/engine/algorithms/agent/MLAgentExecutor.java	0.00%	1 Missing ⚠️
...ml/action/agents/TransportRegisterAgentAction.java	50.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #3978      +/-   ##
============================================
- Coverage     80.38%   80.31%   -0.07%     
- Complexity     7907     7942      +35     
============================================
  Files           693      696       +3     
  Lines         34845    35143     +298     
  Branches       3872     3899      +27     
============================================
+ Hits          28010    28226     +216     
- Misses         5102     5162      +60     
- Partials       1733     1755      +22     

Flag	Coverage Δ
ml-commons	80.31% <70.23%> (-0.07%)	⬇️

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