Optimize lookup table in join operator

[Jackie-Jiang]

Optimize lookup table (right table) in HashJoinOperator:

• Use primitive key map for single join key of type INT, LONG, FLOAT, DOUBLE
• Specialize unique keys case to avoid creating List

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 70.55215% with 48 lines in your changes missing coverage. Please review.

Project coverage is 63.65%. Comparing base (59551e4) to head (9e2f965).
Report is 1680 commits behind head on master.

Files with missing lines	Patch %	Lines
...query/runtime/operator/join/DoubleLookupTable.java	0.00%	12 Missing ⚠️
.../query/runtime/operator/join/FloatLookupTable.java	0.00%	12 Missing ⚠️
...t/query/runtime/operator/join/LongLookupTable.java	0.00%	12 Missing ⚠️
...pinot/query/runtime/operator/HashJoinOperator.java	87.20%	6 Missing and 5 partials ⚠️
...ot/query/runtime/operator/join/IntLookupTable.java	91.66%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #14972      +/-   ##
============================================
+ Coverage     61.75%   63.65%   +1.90%     
- Complexity      207     1483    +1276     
============================================
  Files          2436     2722     +286     
  Lines        133233   152376   +19143     
  Branches      20636    23551    +2915     
============================================
+ Hits          82274    96991   +14717     
- Misses        44911    48076    +3165     
- Partials       6048     7309    +1261     

Flag	Coverage Δ
custom-integration1	100.00% <ø> (+99.99%)	⬆️
integration	100.00% <ø> (+99.99%)	⬆️
integration1	100.00% <ø> (+99.99%)	⬆️
integration2	0.00% <ø> (ø)
java-11	63.63% <70.55%> (+1.92%)	⬆️
java-21	63.53% <70.55%> (+1.90%)	⬆️
skip-bytebuffers-false	63.65% <70.55%> (+1.90%)	⬆️
skip-bytebuffers-true	63.51% <70.55%> (+35.78%)	⬆️
temurin	63.65% <70.55%> (+1.90%)	⬆️
unittests	63.64% <70.55%> (+1.90%)	⬆️
unittests1	56.18% <70.55%> (+9.29%)	⬆️
unittests2	34.00% <0.00%> (+6.27%)	⬆️

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