Move package org.apache.calcite to org.apache.pinot.calcite

[Jackie-Jiang]

Move the Pinot classes under package org.apache.calcite to org.apache.pinot.calcite to avoid confusion

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 62.08%. Comparing base (59551e4) to head (684deed).
Report is 243 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #12837      +/-   ##
============================================
+ Coverage     61.75%   62.08%   +0.33%     
+ Complexity      207      198       -9     
============================================
  Files          2436     2492      +56     
  Lines        133233   135951    +2718     
  Branches      20636    21036     +400     
============================================
+ Hits          82274    84404    +2130     
- Misses        44911    45308     +397     
- Partials       6048     6239     +191     

Flag	Coverage Δ
custom-integration1	<0.01% <0.00%> (-0.01%)	⬇️
integration	<0.01% <0.00%> (-0.01%)	⬇️
integration1	<0.01% <0.00%> (-0.01%)	⬇️
integration2	0.00% <0.00%> (ø)
java-11	62.01% <100.00%> (+0.30%)	⬆️
java-21	61.96% <100.00%> (+0.33%)	⬆️
skip-bytebuffers-false	62.06% <100.00%> (+0.32%)	⬆️
skip-bytebuffers-true	61.91% <100.00%> (+34.19%)	⬆️
temurin	62.08% <100.00%> (+0.33%)	⬆️
unittests	62.07% <100.00%> (+0.33%)	⬆️
unittests1	46.97% <100.00%> (+0.07%)	⬆️
unittests2	27.73% <0.00%> (+<0.01%)	⬆️

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[Jackie-Jiang]

This change is introducing backward incompatibility because we rely on class path during query plan ser/de, and PinotRelExchangeType is part of the ser/de.
We should fix the ser/de so that it doesn't serialize the class path for both efficiency and forward compatibility