Confusion matrix branch

[swkasula]

Related issues
De-serializing the ConfMatrices: Seq[Seq[Long]] resulting in ClassCastException as there was no @JsonDeserialize
annotation used for this attribute: https://github.com/salesforce/TransmogrifAI/pull/533/files

Describe the proposed solution
Fix is it update the ConfMatrices format from Seq[Seq[Long]] -> Seq[ConfusionMatrixPerThreshold] to de-serialize in the right format

Copy of: #545

[codecov]

Codecov Report

Merging #549 (c16fb91) into master (975eb2f) will increase coverage by 86.80%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           master     #549       +/-   ##
===========================================
+ Coverage        0   86.80%   +86.80%     
===========================================
  Files           0      347      +347     
  Lines           0    12026    +12026     
  Branches        0      403      +403     
===========================================
+ Hits            0    10439    +10439     
- Misses          0     1587     +1587     

Impacted Files	Coverage Δ
...op/evaluators/OpMultiClassificationEvaluator.scala	95.80% <100.00%> (ø)
...a/com/salesforce/op/filters/RawFeatureFilter.scala	92.97% <0.00%> (ø)
...ain/scala/com/salesforce/op/aggregators/Text.scala	100.00% <0.00%> (ø)
...s/impl/feature/DecisionTreeNumericBucketizer.scala	94.73% <0.00%> (ø)
...rce/op/stages/impl/feature/HumanNameDetector.scala	95.55% <0.00%> (ø)
...rc/main/scala/com/salesforce/op/stages/HasIn.scala	100.00% <0.00%> (ø)
...mpl/regression/OpGeneralizedLinearRegression.scala	76.92% <0.00%> (ø)
...tages/impl/preparators/SanityCheckerMetadata.scala	89.86% <0.00%> (ø)
...stages/impl/feature/DropIndicesByTransformer.scala	100.00% <0.00%> (ø)
utils/src/main/scala/com/salesforce/op/UID.scala	91.66% <0.00%> (ø)
... and 338 more

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[feifjiang]

lgtm @swkasula

[crupley]

@swkasula can we add a test to confirm the serialization/deserialization is working? That would probably belong in the ModelSelectorSummaryTest

[swkasula]

@swkasula can we add a test to confirm the serialization/deserialization is working? That would probably belong in the ModelSelectorSummaryTest

That's a good point, will add it.

[crupley]

LGTM

[swkasula]

@crupley @tovbinm @nicodv Could you please assist on how the below required checks can be completed to proceed to merge the PR:
security/snyk (Salesforce OSS )
license/snyk (Salesforce OSS

[nicodv]

LGTM

[amateurhuman]

@swkasula I removed the Snyk checks from the repo which cleared them from this PR