add sklearn pipelines

[mike0sv]

closes #218

[codecov]

Codecov Report

Merging #251 (6d97dba) into main (00b0162) will increase coverage by 0.04%.
The diff coverage is 97.61%.

@@            Coverage Diff             @@
##             main     #251      +/-   ##
==========================================
+ Coverage   89.55%   89.59%   +0.04%     
==========================================
  Files          76       76              
  Lines        5449     5470      +21     
==========================================
+ Hits         4880     4901      +21     
  Misses        569      569              

Impacted Files	Coverage Δ
mlem/contrib/pandas.py	92.35% <75.00%> (ø)
mlem/cli/main.py	76.44% <100.00%> (ø)
mlem/contrib/lightgbm.py	94.50% <100.00%> (ø)
mlem/contrib/numpy.py	98.29% <100.00%> (ø)
mlem/contrib/sklearn.py	100.00% <100.00%> (ø)
mlem/contrib/torch.py	98.79% <100.00%> (ø)
mlem/contrib/xgboost.py	97.56% <100.00%> (ø)
mlem/core/artifacts.py	99.40% <100.00%> (ø)
mlem/core/dataset_type.py	95.83% <100.00%> (+0.03%)	⬆️

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