feat: add automated python test generation infrastructure

[mhamilton723]

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[mhamilton723]

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[codecov]

Codecov Report

Merging #998 (5b1d094) into master (9b75183) will decrease coverage by 0.13%.
The diff coverage is 73.00%.

@@            Coverage Diff             @@
##           master     #998      +/-   ##
==========================================
- Coverage   84.92%   84.79%   -0.14%     
==========================================
  Files         196      199       +3     
  Lines        9128     9172      +44     
  Branches      572      543      -29     
==========================================
+ Hits         7752     7777      +25     
- Misses       1376     1395      +19     

Impacted Files	Coverage Δ
...m/microsoft/ml/spark/image/ImageSetAugmenter.scala	95.45% <ø> (ø)
...rosoft/ml/spark/image/ResizeImageTransformer.scala	73.68% <ø> (ø)
.../com/microsoft/ml/spark/stages/ClassBalancer.scala	81.81% <ø> (ø)
...microsoft/ml/spark/cognitive/BingImageSearch.scala	90.90% <25.00%> (-2.49%)	⬇️
.../org/apache/spark/ml/param/UntypedArrayParam.scala	37.50% <37.50%> (ø)
.../microsoft/ml/spark/cognitive/ComputerVision.scala	77.65% <46.15%> (-0.85%)	⬇️
...cala/org/apache/spark/ml/param/ArrayMapParam.scala	55.55% <63.63%> (+1.70%)	⬆️
...om/microsoft/ml/spark/featurize/ValueIndexer.scala	69.11% <64.70%> (-8.50%)	⬇️
...k/recommendation/RankingTrainValidationSplit.scala	76.63% <66.66%> (+0.22%)	⬆️
...ala/org/apache/spark/ml/param/DataFrameParam.scala	69.56% <68.18%> (-30.44%)	⬇️
... and 22 more

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[mhamilton723]

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