Issue 214 add pandas.DataFrame and Series primitives

[csala]

Resolve #214

New "fittings" primitives:

• pandas.DataFrame
• pandas.DataFrame.append
• pandas.DataFrame.drop
• pandas.DataFrame.drop_duplicates
• pandas.DataFrame.dropna
• pandas.DataFrame.fillna
• pandas.DataFrame.filter
• pandas.DataFrame.get
• pandas.DataFrame.join
• pandas.DataFrame.pop
• pandas.DataFrame.select_dtypes
• pandas.DataFrame.set
• pandas.DataFrame.to_numpy
• pandas.Series.filter

[codecov-io]

Codecov Report

Merging #216 into master will decrease coverage by 0.27%. The diff coverage is 0%.

@@            Coverage Diff             @@
##           master     #216      +/-   ##
==========================================
- Coverage   38.45%   38.18%   -0.28%     
==========================================
  Files          26       26              
  Lines        1529     1540      +11     
==========================================
  Hits          588      588              
- Misses        941      952      +11

Impacted Files	Coverage Δ
mlprimitives/datasets.py	0% <0%> (ø)	:arrow_up:

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