Support Icons

[clarasb]

This PR adds icon support for the Button, IconButton and Tabs components by,

• adding an Iconcomponent with the property iconName. iconName has to be a string that corresponds with the names of the Material Icons
• integrating the Icon component into Button, IconButton and Tabs

Other changes:

• in chartlets.py/chartlets/components/button.py: Added size and removed variant property from IconButton
  component to align with component in chartlets.js.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.24%. Comparing base (5d9b673) to head (5b46611).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #138      +/-   ##
==========================================
+ Coverage   92.21%   92.24%   +0.03%     
==========================================
  Files          86       87       +1     
  Lines        1503     1509       +6     
  Branches      231      233       +2     
==========================================
+ Hits         1386     1392       +6     
  Misses         98       98              
  Partials       19       19              

Flag	Coverage Δ
backend	100.00% <100.00%> (ø)
frontend	84.03% <100.00%> (+0.13%)	⬆️

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