Trigger an horizontal scroll through on overflow

[mwouts]

This change improves the rendering of wide tables.

The horizontal scroll bar appears on the table itself, meaning that the search and pagination control remain visible as we scroll.

Thanks to this change, we get a more uniform rendering among Jupyter, Jupyter Book, VS Code and Streamlit.

[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@update_style

(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 (d6a71c8) to head (6927453).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #282      +/-   ##
==========================================
- Coverage   96.16%   96.16%   -0.01%     
==========================================
  Files          27       27              
  Lines        1174     1173       -1     
==========================================
- Hits         1129     1128       -1     
  Misses         45       45              

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