get rid of dataset class and infer pandas format

[mike0sv]

No description provided.

[codecov]

Codecov Report

Merging #199 (9788d6e) into main (d5525e8) will decrease coverage by 0.03%.
The diff coverage is 96.77%.

@@            Coverage Diff             @@
##             main     #199      +/-   ##
==========================================
- Coverage   89.55%   89.51%   -0.04%     
==========================================
  Files          74       74              
  Lines        4911     4923      +12     
==========================================
+ Hits         4398     4407       +9     
- Misses        513      516       +3     

Impacted Files	Coverage Δ
mlem/contrib/pandas.py	96.00% <93.33%> (-0.25%)	⬇️
mlem/contrib/numpy.py	94.94% <100.00%> (ø)
mlem/core/dataset_type.py	96.31% <100.00%> (ø)
mlem/core/objects.py	91.19% <100.00%> (+0.02%)	⬆️
mlem/contrib/heroku/meta.py	82.85% <0.00%> (-2.86%)	⬇️
mlem/cli/apply.py	95.23% <0.00%> (ø)
mlem/api/commands.py	88.88% <0.00%> (ø)
mlem/core/requirements.py	95.54% <0.00%> (+0.01%)	⬆️

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