ValueKind coder

[ahmedabu98]

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[kennknowles]

Nice. This way it leverages the stability of the proto definition.

[codecov]

Codecov Report

❌ Patch coverage is 61.90476% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 58.39%. Comparing base (b20e5fd) to head (091592f).
⚠️ Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
...ava/org/apache/beam/sdk/coders/ValueKindCoder.java	57.89%	6 Missing and 2 partials ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #39989      +/-   ##
============================================
+ Coverage     56.07%   58.39%   +2.31%     
- Complexity     2284    13555   +11271     
============================================
  Files          1120     2574    +1454     
  Lines        176677   268890   +92213     
  Branches       1475    11056    +9581     
============================================
+ Hits          99073   157020   +57947     
- Misses        75093   105909   +30816     
- Partials       2511     5961    +3450     

Flag	Coverage Δ
java	64.57% <61.90%> (-11.09%)	⬇️

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