Minimal builder for JupyterLab ecosystem

[fcollonval]

This is a very early draft (not tested) extracting from JupyterLab builder commands for extensions.

• Drop the need for LabApp
• Extract code imported from jupyterlab_server
• Add test
• test
• test more

[codecov]

Codecov Report

Base: 91.74% // Head: 14.30% // Decreases project coverage by -77.44% ⚠️

Coverage data is based on head (cdd8051) compared to base (d8fb336).
Patch coverage: 0.00% of modified lines in pull request are covered.

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #107       +/-   ##
===========================================
- Coverage   91.74%   14.30%   -77.44%     
===========================================
  Files           5       12        +7     
  Lines         218     1398     +1180     
  Branches       55      308      +253     
===========================================
  Hits          200      200               
- Misses         12     1191     +1179     
- Partials        6        7        +1     

Impacted Files	Coverage Δ
hatch_jupyter_builder/debuglog.py	0.00% <0.00%> (ø)
hatch_jupyter_builder/extension_utils.py	0.00% <0.00%> (ø)
hatch_jupyter_builder/federated_labextensions.py	0.00% <0.00%> (ø)
hatch_jupyter_builder/jlpmapp.py	0.00% <0.00%> (ø)
hatch_jupyter_builder/labextensions.py	0.00% <0.00%> (ø)
hatch_jupyter_builder/semver.py	0.00% <0.00%> (ø)
hatch_jupyter_builder/upgrade_extension.py	0.00% <0.00%> (ø)

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