Add create_complex_regression_pipeline to sklearn_model_utils.py

[gaugup]

Description

Add create_complex_regression_pipeline to sklearn_model_utils.py. Some of the test code in dice-ml can be migrated to rai_test_utils. So adding some functionality in rai_test_utils which can be upstreamed into dice-ml.

Checklist

• I have added screenshots above for all UI changes.
• I have added e2e tests for all UI changes.
• Documentation was updated if it was needed.

[codecov-commenter]

Codecov Report

Merging #2318 (618f8c9) into main (61c70d0) will increase coverage by 3.95%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #2318      +/-   ##
==========================================
+ Coverage   88.42%   92.37%   +3.95%     
==========================================
  Files         133      107      -26     
  Lines        7575     5391    -2184     
==========================================
- Hits         6698     4980    -1718     
+ Misses        877      411     -466     

Flag	Coverage Δ
unittests	92.37% <100.00%> (+3.95%)	⬆️

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Files Changed	Coverage Δ
...st_utils/rai_test_utils/models/sklearn/__init__.py	100.00% <ø> (ø)
...i_test_utils/models/sklearn/sklearn_model_utils.py	74.54% <100.00%> (+3.11%)	⬆️
rai_test_utils/rai_test_utils/version.py	100.00% <100.00%> (ø)

... and 26 files with indirect coverage changes

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