Add support for FigureWidget events

[philippjfr]

Adds support for rendering plotly FigureWidget including event handler support.

[codecov]

Codecov Report

Attention: Patch coverage is 75.00000% with 21 lines in your changes missing coverage. Please review.

Project coverage is 86.75%. Comparing base (b92f0c9) to head (8da6f40).
Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
panel/pane/plotly.py	58.33%	20 Missing ⚠️
panel/tests/ui/pane/test_plotly.py	97.22%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7654      +/-   ##
==========================================
- Coverage   86.77%   86.75%   -0.02%     
==========================================
  Files         346      346              
  Lines       52217    52302      +85     
==========================================
+ Hits        45313    45377      +64     
- Misses       6904     6925      +21     

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