Load only required resources

[philippjfr]

Ensures that if the extension has been loaded we only serve resources for the extensions that have been requested.

[codecov]

Codecov Report

Merging #4562 (153023d) into main (f9ee6ea) will decrease coverage by 0.03%.
The diff coverage is 68.18%.

@@            Coverage Diff             @@
##             main    #4562      +/-   ##
==========================================
- Coverage   83.56%   83.54%   -0.03%     
==========================================
  Files         254      254              
  Lines       36780    36814      +34     
==========================================
+ Hits        30736    30755      +19     
- Misses       6044     6059      +15     

Flag	Coverage Δ
ui-tests	39.56% <68.18%> (+<0.01%)	⬆️
unitexamples-tests	73.64% <68.18%> (-0.01%)	⬇️

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Impacted Files	Coverage Δ
panel/config.py	56.33% <0.00%> (-0.88%)	⬇️
panel/reactive.py	80.60% <ø> (ø)
panel/io/resources.py	84.18% <76.19%> (-0.53%)	⬇️
panel/util/__init__.py	87.34% <80.00%> (-0.21%)	⬇️
panel/io/state.py	70.57% <85.71%> (+0.18%)	⬆️

... and 1 file with indirect coverage changes

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