Improved support for ipywidgets>=8.0.5

[philippjfr]

In ipywidgets >= 8.0.5 a separate comm package handles the Comm creation. In a notebook context the create_comm method is monkey-patched and in a server context we simply create a comm directly in the _on_widget_constructed hook but when using pn.serve or when building our documentation there is no state.curdoc defined and therefore we cannot hook up the Comm correctly when the widget is created. Therefore we patch the comm package with create_comm hook that creates a DummyComm which is later replaced.

[codecov]

Codecov Report

Merging #4766 (b6b6434) into main (12e2810) will decrease coverage by 10.13%.
The diff coverage is 0.00%.

@@             Coverage Diff             @@
##             main    #4766       +/-   ##
===========================================
- Coverage   83.29%   73.17%   -10.13%     
===========================================
  Files         268      268               
  Lines       37745    37753        +8     
===========================================
- Hits        31441    27626     -3815     
- Misses       6304    10127     +3823     

Flag	Coverage Δ
ui-tests	?
unitexamples-tests	73.17% <0.00%> (-0.02%)	⬇️

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Impacted Files	Coverage Δ
panel/io/ipywidget.py	0.00% <0.00%> (ø)

... and 55 files with indirect coverage changes

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