feat: Unify MapStream and Unary Map Operations Using a Shared gRPC Protocol

[yhl25]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 75.75758% with 16 lines in your changes missing coverage. Please review.

Please upload report for BASE (main@a5cdc00). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
...java/io/numaproj/numaflow/mapstreamer/Service.java	74.50%	12 Missing and 1 partial ⚠️
...ava/io/numaproj/numaflow/sinker/SinkerTestKit.java	0.00%	3 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #146   +/-   ##
=======================================
  Coverage        ?   60.53%           
  Complexity      ?      392           
=======================================
  Files           ?      126           
  Lines           ?     2762           
  Branches        ?      189           
=======================================
  Hits            ?     1672           
  Misses          ?      955           
  Partials        ?      135           

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