Add rich tables

[murilo-cunha]

Add rich table (HTML) rendering to notebook.

• Other HTML elements are not displayed.
• Fall back to displaying text if that's the case
• Refactor logic to simplify this
• Refactor logic to gracefully show not supported mime types (anything that is not one of image/png, text/html, text/plain

[codecov]

Codecov Report

Merging #59 (c9b46a4) into main (1d8cdb7) will decrease coverage by 0.15%.
The diff coverage is 92.85%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #59      +/-   ##
==========================================
- Coverage   96.37%   96.21%   -0.16%     
==========================================
  Files          26       28       +2     
  Lines        1433     1481      +48     
==========================================
+ Hits         1381     1425      +44     
- Misses         52       56       +4     

Impacted Files	Coverage Δ
databooks/data_models/rich_helpers.py	90.69% <90.69%> (ø)
databooks/data_models/cell.py	95.34% <100.00%> (ø)
tests/test_cli.py	100.00% <100.00%> (ø)
tests/test_data_models/test_rich_helpers.py	100.00% <100.00%> (ø)
tests/test_tui.py	100.00% <100.00%> (ø)