Feature: return self in transformer fit + dataframe in benchmark transformation

[rushilg99]

No description provided.

[codecov]

Codecov Report

Merging #1208 (9f01dcd) into develop (c5602c1) will decrease coverage by 0.05%.
Report is 1 commits behind head on develop.
The diff coverage is 0.00%.

❗ Current head 9f01dcd differs from pull request most recent head 16ab04e. Consider uploading reports for the commit 16ab04e to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1208      +/-   ##
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- Coverage    77.42%   77.38%   -0.05%     
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  Files           62       62              
  Lines         5250     5253       +3     
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  Hits          4065     4065              
- Misses        1185     1188       +3     

Files	Coverage Δ
macrosynergy/learning/preds_to_pnl.py	17.77% <ø> (ø)
macrosynergy/learning/transformers.py	20.61% <0.00%> (-0.66%)	⬇️