Improvements for pyodide handling

[philippjfr]

• Add state._is_pyodide property to unify detection of pyodide context
• Suppress warnings

[MarcSkovMadsen]

Would it not be nice for users to have public access to the property?

Then they can import in one way if in pyodide and another if not etc.

[philippjfr]

Would it not be nice for users to have public access to the property?

On the one hand yes, but it's really not Panel's responsibility to handle this and in the long run pyodide may not be the only WASM runtime that is supported. So I'd prefer to keep this as private API for the time being.

[codecov]

Codecov Report

Merging #3444 (552f11a) into master (2ba0b94) will decrease coverage by 0.00%.
The diff coverage is 77.77%.

@@            Coverage Diff             @@
##           master    #3444      +/-   ##
==========================================
- Coverage   82.92%   82.91%   -0.01%     
==========================================
  Files         198      198              
  Lines       27018    27014       -4     
==========================================
- Hits        22406    22400       -6     
- Misses       4612     4614       +2     

Impacted Files	Coverage Δ
panel/io/pyodide.py	0.00% <0.00%> (ø)
panel/io/__init__.py	87.50% <100.00%> (ø)
panel/io/callbacks.py	72.99% <100.00%> (+0.33%)	⬆️
panel/io/state.py	69.08% <100.00%> (ø)
panel/io/reload.py	69.56% <0.00%> (-2.18%)	⬇️
panel/tests/command/test_serve.py	83.54% <0.00%> (-1.46%)	⬇️
panel/io/server.py	78.04% <0.00%> (-0.22%)	⬇️
panel/pane/idom.py	27.40% <0.00%> (+0.20%)	⬆️

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