[DISC] Having IbisML closer to sklearn

[gtauzin]

Following discussion in #135, I thought I would give it a try and set up a wrapper of IbisML steps as fully-fledged sklearn transformers so that they follow more closely the sklearn API.

Running the adapted example notebook, you can already check that :

• An ibis step wrapped into a transformer within the sklearn pipeline does not eagerly execute;
• get_params works as intended.

I'll edit this msg later with a list of more detailed points.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 35.29412% with 22 lines in your changes missing coverage. Please review.

Project coverage is 84.08%. Comparing base (80881f8) to head (e2f99c6).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
ibis_ml/estimators.py	33.33%	22 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #141      +/-   ##
==========================================
- Coverage   84.94%   84.08%   -0.87%     
==========================================
  Files          26       27       +1     
  Lines        1920     1954      +34     
==========================================
+ Hits         1631     1643      +12     
- Misses        289      311      +22     

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[gtauzin]

Closing as @jcrist made it clear that having Steps as sklean transformer would not be a good idea in #135 .