Visualize metadata cat

[khillion]

Description

Add visualization for categorical features of metadata with parallel category diagram.

It helps giving a quick overview of how features are distributed in your metadata.

Changelogs

• add .visualize_categories method to MetadataParser

Definition of Done

• [x] New code is tested with unit tests
• [x] Documentation has been updated
• [ ] Pull Request has been revised by a maintainer of the project

[khillion]

I am going to update a bit the documentation to try to make it simpler too and use black to reformat the code (we can discuss later if we make it built in the CI and therefore mandatory).

[codecov-io]

Codecov Report

Merging #62 (8063c46) into master (aa19607) will increase coverage by 0.11%. The diff coverage is 88.88%.

@@            Coverage Diff             @@
##           master      #62      +/-   ##
==========================================
+ Coverage   56.77%   56.89%   +0.11%     
==========================================
  Files          58       58              
  Lines        2221     2241      +20     
==========================================
+ Hits         1261     1275      +14     
- Misses        960      966       +6     

Flag	Coverage Δ
unittests	56.89% <88.88%> (+0.11%)	:arrow_up:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
moonstone/parsers/metadata.py	90.90% <81.25%> (-9.10%)	:arrow_down:
moonstone/filtering/mean_filtering.py	71.21% <94.73%> (ø)
moonstone/utils/pandas/series.py	96.00% <94.73%> (ø)
moonstone/parsers/base.py	100.00% <100.00%> (ø)

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