Preprocessing enhancement

[xandaau]

Code draft for the pandas data preprocessing tools enhancement. Linked issues: #14 #21

After the discussion, draft code will be edited, docstrings and tests written.

[codecov-commenter]

Codecov Report

Merging #22 (ccf4b16) into dev (b97370e) will decrease coverage by 0.33%. The diff coverage is 84.47%.

@@            Coverage Diff             @@
##              dev      #22      +/-   ##
==========================================
- Coverage   84.21%   83.88%   -0.33%     
==========================================
  Files          40       41       +1     
  Lines        2743     3016     +273     
==========================================
+ Hits         2310     2530     +220     
- Misses        433      486      +53     

Impacted Files	Coverage Δ
ambrosia/preprocessing/ml_var_reducer.py	78.02% <43.75%> (-8.23%)	:arrow_down:
ambrosia/preprocessing/preprocessor.py	68.49% <69.23%> (+1.10%)	:arrow_up:
ambrosia/preprocessing/cuped.py	89.71% <70.00%> (-0.64%)	:arrow_down:
ambrosia/tools/ab_abstract_component.py	89.51% <88.88%> (+1.55%)	:arrow_up:
ambrosia/preprocessing/robust.py	81.52% <90.47%> (+6.52%)	:arrow_up:
ambrosia/preprocessing/__init__.py	100.00% <100.00%> (ø)
ambrosia/__init__.py	100.00% <0.00%> (ø)
ambrosia/tools/log.py	100.00% <0.00%> (+33.33%)	:arrow_up:

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