Add histogram to metrics container

[Naireen]

Add histogram to metrics container. The histogram representation here is the DataflowHistogramValue representation.

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 59.00%. Comparing base (2488ca1) to head (e0dcf4c).
Report is 11 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #33043      +/-   ##
============================================
+ Coverage     58.90%   59.00%   +0.10%     
  Complexity     3112     3112              
============================================
  Files          1131     1132       +1     
  Lines        174613   174997     +384     
  Branches       3357     3357              
============================================
+ Hits         102856   103265     +409     
+ Misses        68403    68378      -25     
  Partials       3354     3354              

Flag	Coverage Δ
python	81.57% <ø> (+0.13%)	⬆️

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