Add the column visibility button

[mwouts]

Closes #284

[github-actions]

Thank you for making this pull request.

Did you know? You can try it on Binder: .

Also, the version of ITables developed in this PR can be installed with pip:

pip install git+https://github.com/mwouts/itables.git@column_visibility

(this requires nodejs, see more at Developing ITables)

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.16%. Comparing base (1b42c1c) to head (a6935c2).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #286   +/-   ##
=======================================
  Coverage   96.15%   96.16%           
=======================================
  Files          27       27           
  Lines        1171     1174    +3     
=======================================
+ Hits         1126     1129    +3     
  Misses         45       45           

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