PPL integration with AD and ml-commons

[jackiehanyang]

Description

This PR is for PPL integration with AD and ml-commons, and it adds two new commands: KMEANS and AD.

• KEMANS PR - PPL Integration - Add implementation for KMeans algorithm #407
• AD PR - Add AD command for PPL/AD integration #455

Issues Resolved

N/A

Issues Created

• Support more arguments for KEMANS and AD commands
  
• Add documentation and doctest for KEMANS and AD commands

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

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
For more information on following Developer Certificate of Origin and signing off your commits, please check here.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 40.46243% with 103 lines in your changes missing coverage. Please review.
✅ Project coverage is 95.25%. Comparing base (10a9846) to head (c13a368).
⚠️ Report is 1148 commits behind head on main.

Files with missing lines	Patch %	Lines
...rch/planner/physical/MLCommonsOperatorActions.java	1.75%	56 Missing ⚠️
...ch/sql/opensearch/planner/physical/ADOperator.java	0.00%	27 Missing ⚠️
...opensearch/planner/physical/MLCommonsOperator.java	30.43%	15 Missing and 1 partial ⚠️
...org/opensearch/sql/opensearch/client/MLClient.java	0.00%	3 Missing ⚠️
...a/org/opensearch/sql/utils/MLCommonsConstants.java	0.00%	1 Missing ⚠️

❌ Your project status has failed because the head coverage (95.25%) is below the target coverage (99.00%). You can increase the head coverage or adjust the target coverage.

Additional details and impacted files

@@              Coverage Diff              @@
##               main     #468       +/-   ##
=============================================
+ Coverage     62.91%   95.25%   +32.33%     
- Complexity        0     2746     +2746     
=============================================
  Files            10      276      +266     
  Lines           658     7414     +6756     
  Branches        118      537      +419     
=============================================
+ Hits            414     7062     +6648     
- Misses          191      298      +107     
- Partials         53       54        +1     

Flag	Coverage Δ
query-workbench	62.91% <ø> (ø)
sql-engine	98.40% <40.46%> (?)

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[penghuo]

LGTM