Add a framework to validate each of the Ingestion Transformation functions

[deepthi912]

This PR adds a validation framework for Pinot transform functions used in ingestion configs. It provides validation hooks for datatype checks in the TransformFunction interface that individual functions can implement to validate their configurations during table creation.

We can include validationMode in the transform function specification:

1. LEGACY Mode (Default)
   Purpose: Backward compatibility - allows all existing type conversions
   Behavior: No validation, accepts everything (current Pinot behavior)
   Use Case: Existing tables that shouldn't break
2. LENIENT Mode (Recommended)
   Purpose: Safe type conversions allowed
   Behavior: Allows safe conversions like INT→LONG, FLOAT→DOUBLE, but blocks unsafe ones like STRING→INT
   Use Case: New tables that want some safety but flexibility
3. STRICT Mode
   Purpose: Maximum type safety
   Behavior: No automatic type conversions, exact type matching required
   Use Case: Critical tables where type safety is paramount

{
  "columnName": "processed_age",
  "transformFunction": "CAST(age_string AS INT)",
  "validationMode": "STRICT"
}

[codecov-commenter]

Codecov Report

❌ Patch coverage is 52.63158% with 9 lines in your changes missing coverage. Please review.
✅ Project coverage is 63.45%. Comparing base (1b6866d) to head (3b4410f).
⚠️ Report is 131 commits behind head on master.

Files with missing lines	Patch %	Lines
...operator/transform/function/TransformFunction.java	0.00%	7 Missing ⚠️
...ot/spi/config/table/ingestion/IngestionConfig.java	33.33%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #17039      +/-   ##
============================================
+ Coverage     56.42%   63.45%   +7.03%     
- Complexity      702     1419     +717     
============================================
  Files          2406     3084     +678     
  Lines        133681   182157   +48476     
  Branches      21260    27953    +6693     
============================================
+ Hits          75424   115596   +40172     
- Misses        51983    57647    +5664     
- Partials       6274     8914    +2640     

Flag	Coverage Δ
custom-integration1	100.00% <ø> (?)
integration	100.00% <ø> (+100.00%)	⬆️
integration1	100.00% <ø> (?)
integration2	0.00% <ø> (ø)
java-11	63.42% <52.63%> (+7.04%)	⬆️
java-21	63.42% <52.63%> (+7.02%)	⬆️
temurin	63.45% <52.63%> (+7.03%)	⬆️
unittests	63.45% <52.63%> (+7.03%)	⬆️
unittests1	56.30% <47.36%> (-0.13%)	⬇️
unittests2	33.61% <52.63%> (?)

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