use work processing context in work processing

[m-trieu]

Add work processing context

R: @scwhittle

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[m-trieu]

assign set of reviewers

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R: @johnjcasey added as fallback since no labels match configuration

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[m-trieu]

ready for another look @scwhittle

I went with the sort of a SteppedBuilder https://github.com/google/auto/blob/main/value/userguide/builders-howto.md#-create-a-step-builder approach for passing the ProcessingContext out of GrpcDirectGetWorkStream. The receiver just has to setProcessWorkFn and then build.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 71.42%. Comparing base (bcac88b) to head (2109108). Report is 73 commits behind head on master.

:exclamation: Current head 2109108 differs from pull request most recent head 3c0702a

Please upload reports for the commit 3c0702a to get more accurate results.

Additional details and impacted files

@@            Coverage Diff            @@
##             master   #31148   +/-   ##
=========================================
  Coverage     71.42%   71.42%           
  Complexity     1474     1474           
=========================================
  Files           909      909           
  Lines        113707   113707           
  Branches       1076     1076           
=========================================
  Hits          81217    81217           
  Misses        30471    30471           
  Partials       2019     2019           

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Reminder, please take a look at this pr: @johnjcasey

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R: @johnjcasey added as fallback since no labels match configuration

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