FEAT-#493: Extensible.

[rentruewang]

After this refactor, Making Vis etc support the pandas library is as easy as defining 4 1-liner classes.

Overview

For example, for modin defining this one-liner class is enough for it to be used with Vis:

class LuxModinDF(LuxDataFrameMixin, modin.DataFrame): pass

then wrap the dataframe df by:

df = LuxModinDF(df)

Changes

I refactored Lux's pandas subclasses into mixins and thin wrappers using mixins (much like the above one liner).

Example Output

No change.

[dorisjlee]

@rentruewang can you run the linter to prevent test fail?

[rentruewang]

@dorisjlee Do you know what linter I should run? I was able to pass pre-commit, and I didn't make changes to those that failed black --check. Would you like me to run black on those files?

[codecov]

Codecov Report

Patch coverage: 98.70% and project coverage change: -0.18 ⚠️

Comparison is base (05fd0fe) 72.76% compared to head (637ef0c) 72.59%.

❗ Current head 637ef0c differs from pull request most recent head 91a0799. Consider uploading reports for the commit 91a0799 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #494      +/-   ##
==========================================
- Coverage   72.76%   72.59%   -0.18%     
==========================================
  Files          56       56              
  Lines        4619     4619              
==========================================
- Hits         3361     3353       -8     
- Misses       1258     1266       +8     

Impacted Files	Coverage Δ
lux/core/series.py	57.52% <95.00%> (+0.76%)	⬆️
lux/core/frame.py	80.83% <100.00%> (+0.04%)	⬆️
lux/core/groupby.py	100.00% <100.00%> (ø)
lux/executor/PandasExecutor.py	93.96% <100.00%> (+0.01%)	⬆️

... and 2 files with indirect coverage changes

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