Add fetchPartitionCount and fetchStreamPartitionOffset implementation api for pinot-kinesis

[xiangfu0]

Implement fetchPartitionCount and fetchStreamPartitionOffset APIs.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 56.52174% with 10 lines in your changes missing coverage. Please review.

Project coverage is 63.90%. Comparing base (59551e4) to head (78dfda4).
Report is 1505 commits behind head on master.

Files with missing lines	Patch %	Lines
.../stream/kinesis/KinesisStreamMetadataProvider.java	59.09%	8 Missing and 1 partial ⚠️
.../plugin/stream/kinesis/KinesisConsumerFactory.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #14713      +/-   ##
============================================
+ Coverage     61.75%   63.90%   +2.15%     
- Complexity      207     1612    +1405     
============================================
  Files          2436     2714     +278     
  Lines        133233   149693   +16460     
  Branches      20636    22914    +2278     
============================================
+ Hits          82274    95659   +13385     
- Misses        44911    47013    +2102     
- Partials       6048     7021     +973     

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	63.81% <56.52%> (+2.10%)	⬆️
java-21	63.80% <56.52%> (+2.17%)	⬆️
skip-bytebuffers-false	63.86% <56.52%> (+2.11%)	⬆️
skip-bytebuffers-true	63.74% <56.52%> (+36.01%)	⬆️
temurin	63.90% <56.52%> (+2.15%)	⬆️
unittests	63.89% <56.52%> (+2.15%)	⬆️
unittests1	56.23% <ø> (+9.34%)	⬆️
unittests2	34.43% <56.52%> (+6.70%)	⬆️

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