(WIP) graceful shutdown - yhl's version

[KeranYang]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 16.45570% with 66 lines in your changes missing coverage. Please review.

Please upload report for BASE (main@134414a). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
.../io/numaproj/numaflow/sinker/GrpcServerHelper.java	2.56%	38 Missing ⚠️
.../main/java/io/numaproj/numaflow/sinker/Server.java	27.77%	24 Missing and 2 partials ⚠️
...main/java/io/numaproj/numaflow/sinker/Service.java	50.00%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #152   +/-   ##
=======================================
  Coverage        ?   58.90%           
  Complexity      ?      393           
=======================================
  Files           ?      127           
  Lines           ?     2842           
  Branches        ?      197           
=======================================
  Hits            ?     1674           
  Misses          ?     1031           
  Partials        ?      137           

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