Updates for OneHotEncoder in newer SKL versions

[ksaur]

Working on #684
Prototype for ints works, simple strings work

todo: Some problem with the user issue example.
todo: More impl/testing for strings.

in progress

[codecov-commenter]

Codecov Report

Merging #696 (afff99a) into main (ea84cc5) will increase coverage by 0.01%.
The diff coverage is 92.85%.

@@            Coverage Diff             @@
##             main     #696      +/-   ##
==========================================
+ Coverage   90.14%   90.15%   +0.01%     
==========================================
  Files          80       80              
  Lines        4625     4674      +49     
  Branches      848      864      +16     
==========================================
+ Hits         4169     4214      +45     
- Misses        259      261       +2     
- Partials      197      199       +2     

Flag	Coverage Δ
unittests	90.15% <92.85%> (+0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...tor_converters/_one_hot_encoder_implementations.py	93.93% <92.15%> (-2.29%)	⬇️
.../ml/operator_converters/sklearn/one_hot_encoder.py	100.00% <100.00%> (ø)

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