Add configs to specify keepAlive and shutdownTimeout for GrpcQueryClient

[mayankshriv]

Added configs to specify keepAlive and shutdownTimeout for GrpcQueryClient.

• Added channelShutdownTimeoutSecond config for GrpcQueryClient with default of 10s.
• Added configs for keep-alive:
  • channelKeepAliveEnabled to enable/disable the feature, default false.
  • channelKeepAliveTimeSeconds to configures the interval for sending keep-alive pings, default 300 seconds (5 minutes).
  • channelKeepAliveTimeoutSeconds configures the timeout for waiting for a ping acknowledgment, default 300 seconds (5 minutes).
  • channelKeepAliveWithoutCalls ensures pings are sent even when there are no active calls, keeping the connection alive during idle period, default true.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 16 lines in your changes missing coverage. Please review.

Project coverage is 62.12%. Comparing base (59551e4) to head (d3889a5). Report is 730 commits behind head on master.

Files	Patch %	Lines
...pache/pinot/common/utils/grpc/GrpcQueryClient.java	0.00%	12 Missing :warning:
...ava/org/apache/pinot/common/config/GrpcConfig.java	0.00%	4 Missing :warning:

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #13546      +/-   ##
============================================
+ Coverage     61.75%   62.12%   +0.37%     
+ Complexity      207      198       -9     
============================================
  Files          2436     2558     +122     
  Lines        133233   140916    +7683     
  Branches      20636    21866    +1230     
============================================
+ Hits          82274    87543    +5269     
- Misses        44911    46741    +1830     
- Partials       6048     6632     +584     

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java-21	61.98% <0.00%> (+0.36%)	:arrow_up:
skip-bytebuffers-false	62.10% <0.00%> (+0.35%)	:arrow_up:
skip-bytebuffers-true	61.96% <0.00%> (+34.23%)	:arrow_up:
temurin	62.12% <0.00%> (+0.37%)	:arrow_up:
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unittests2	27.69% <0.00%> (-0.04%)	:arrow_down:

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