Add more flake8 checks

[cthoyt]

Summary

Part of #25

This pull request adds the flake8-docstrings and a few other plugins that ensures all code is documented and other checks. It also does the very hard work of going back and documenting undocumented code.

• [x] Code passes all tests
• [x] Unit tests provided for these changes
• [x] Documentation and docstrings added for these changes

Changes

• Adds the following flake8 plugins:
  • flake8-docstrings
  • pep8-naming
  • flake8-bugbear
  • pydocstyle
• Updates code to conform with new plugins

[codecov-commenter]

Codecov Report

Merging #35 (4f3ff74) into main (9d10d45) will increase coverage by 0.00%. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main      #35   +/-   ##
=======================================
  Coverage   99.48%   99.49%           
=======================================
  Files          29       29           
  Lines         587      590    +3     
=======================================
+ Hits          584      587    +3     
  Misses          3        3           

Impacted Files	Coverage Δ
chemicalx/data/datasetloader.py	96.07% <ø> (ø)
chemicalx/version.py	100.00% <ø> (ø)
tests/unit/test_batching.py	100.00% <ø> (ø)
tests/unit/test_dataset.py	100.00% <ø> (ø)
tests/unit/test_datastructures.py	100.00% <ø> (ø)
chemicalx/__init__.py	100.00% <100.00%> (ø)
chemicalx/data/__init__.py	100.00% <100.00%> (ø)
chemicalx/data/batchgenerator.py	98.57% <100.00%> (+0.02%)	:arrow_up:
chemicalx/data/contextfeatureset.py	100.00% <100.00%> (ø)
chemicalx/data/drugfeatureset.py	100.00% <100.00%> (ø)
... and 19 more

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[cthoyt]

@benedekrozemberczki this is ready

[benedekrozemberczki]

This is amazing @cthoyt, let me merge!