Allow loading ESM bundles from URL

[philippjfr]

This allows compiled bundles to be loaded from the component resource endpoint which makes it possible for the bundle to be cached by the browser (rather than having to send it across the websocket each time).

[codecov]

Codecov Report

Attention: Patch coverage is 85.00000% with 3 lines in your changes missing coverage. Please review.

Project coverage is 82.23%. Comparing base (0b59d53) to head (3b0b2d3).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
panel/custom.py	85.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7410      +/-   ##
==========================================
- Coverage   82.23%   82.23%   -0.01%     
==========================================
  Files         337      337              
  Lines       50557    50572      +15     
==========================================
+ Hits        41575    41586      +11     
- Misses       8982     8986       +4     

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