[Backport 2.4] A Generic ML Command in PPL

[opensearch-trigger-bot]

Backport c6b234c from #971

[codecov-commenter]

Codecov Report

Merging #997 (2880e76) into 2.4 (634e2ff) will decrease coverage by 2.09%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##                2.4     #997      +/-   ##
============================================
- Coverage     97.60%   95.51%   -2.10%     
- Complexity     3185     3223      +38     
============================================
  Files           308      320      +12     
  Lines          7983     8716     +733     
  Branches        520      643     +123     
============================================
+ Hits           7792     8325     +533     
- Misses          190      334     +144     
- Partials          1       57      +56     

Flag	Coverage Δ
query-workbench	62.76% <ø> (?)
sql-engine	98.18% <100.00%> (+0.58%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...a/org/opensearch/sql/utils/MLCommonsConstants.java	0.00% <ø> (ø)
...ain/java/org/opensearch/sql/analysis/Analyzer.java	100.00% <100.00%> (ø)
...a/org/opensearch/sql/analysis/TypeEnvironment.java	100.00% <100.00%> (ø)
.../org/opensearch/sql/planner/logical/LogicalML.java	100.00% <100.00%> (ø)
...ch/sql/planner/logical/LogicalPlanNodeVisitor.java	100.00% <100.00%> (ø)
.../sql/planner/physical/PhysicalPlanNodeVisitor.java	100.00% <100.00%> (ø)
...ecutor/protector/OpenSearchExecutionProtector.java	100.00% <100.00%> (ø)
...rch/planner/physical/MLCommonsOperatorActions.java	67.36% <100.00%> (+66.06%)	⬆️
...ch/sql/opensearch/planner/physical/MLOperator.java	100.00% <100.00%> (ø)
...search/sql/opensearch/storage/OpenSearchIndex.java	100.00% <100.00%> (ø)
... and 12 more

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