Enable Html stripping

[michaelweilsalesforce]

Related issues

When engineering features from a Text (and Text-like) raw features, we should strip the text of any html tags, which doesn't add signal to existing tokens (and even pollutes them).

Describe the proposed solution

Enable html stripping via TextTokenizer.AnalyzerHtmlStrip

[michaelweilsalesforce]

This PR doesn't introduce options yet

[codecov[bot]]

Codecov Report

Merging #478 into master will increase coverage by 0.00%. The diff coverage is 100.00%.

@@           Coverage Diff            @@
##           master     #478    +/-   ##
========================================
  Coverage   87.00%   87.01%            
========================================
  Files         345      345            
  Lines       11673    11680     +7     
  Branches      388      613   +225     
========================================
+ Hits        10156    10163     +7     
  Misses       1517     1517            

Impacted Files	Coverage Δ
...n/scala/com/salesforce/op/dsl/RichMapFeature.scala	67.64% <ø> (ø)
.../scala/com/salesforce/op/dsl/RichTextFeature.scala	82.19% <100.00%> (+0.24%)	:arrow_up:
...p/stages/impl/feature/SmartTextMapVectorizer.scala	100.00% <100.00%> (ø)
...e/op/stages/impl/feature/SmartTextVectorizer.scala	95.20% <100.00%> (+0.03%)	:arrow_up:
...esforce/op/stages/impl/feature/TextTokenizer.scala	97.36% <100.00%> (+0.14%)	:arrow_up:
...sforce/op/stages/impl/feature/Transmogrifier.scala	98.05% <100.00%> (ø)

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[TuanNguyen27]

@leahmcguire @Jauntbox could you take a look at this PR ? I'm not sure how to test my changes :(

[gerashegalov]

Let us actually fill out the form for the PR description to set the context :)