Ensure Plotly interactivity works when Plotly panes are displayed in tabs

[philippjfr]

Uses JS callbacks to ensure that Plotly panes displayed inside Tabs are hidden when the tab they are in is not active. This ensures that interactivity on the plots still works even when they are overlapping.

Fixes #804

[codecov]

Codecov Report

Merging #2418 (c791316) into master (040b887) will increase coverage by 0.03%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #2418      +/-   ##
==========================================
+ Coverage   83.45%   83.49%   +0.03%     
==========================================
  Files         185      185              
  Lines       22680    22734      +54     
==========================================
+ Hits        18928    18982      +54     
  Misses       3752     3752              

Impacted Files	Coverage Δ
panel/pane/plotly.py	92.75% <100.00%> (+1.32%)	⬆️
panel/tests/pane/test_plotly.py	98.73% <100.00%> (+0.20%)	⬆️

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