Switch to entrypoints package

[fcollonval]

Use entrypoints package to list translation entry points

Advantages:

• It is already a dependency (from the notebook server)
• it is more efficient than pkgresources
• it lists the entry points from the current sys.path => no need to run the listing in a subprocess

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[goanpeca]

🚀

[bollwyvl]

Hooray not relying on undeclared runtime setuptools dependency!

I would recommend adding entrypoints as an explicit dependency in setup.cfg or .py (wherever), as notebook would, along with nbclassic, be dropped in the already-started 4.0.0 line of lab. Though nbconvert will likely continue to use it, most likely, where it's been pinned to entrypoints >=0.2.2).

[fcollonval]

Thanks for the suggestion @bollwyvl
i updated the PR.

[codecov-commenter]

Codecov Report

Merging #187 (cc92230) into master (6ecc630) will decrease coverage by 0.58%.
The diff coverage is 93.33%.

@@            Coverage Diff             @@
##           master     #187      +/-   ##
==========================================
- Coverage   78.55%   77.97%   -0.59%     
==========================================
  Files          27       27              
  Lines        1996     1993       -3     
==========================================
- Hits         1568     1554      -14     
- Misses        428      439      +11     

Impacted Files	Coverage Δ
jupyterlab_server/translation_utils.py	82.41% <92.30%> (-4.80%)	⬇️
jupyterlab_server/tests/test_translation_api.py	98.50% <100.00%> (-0.13%)	⬇️
jupyterlab_server/handlers.py	87.82% <0.00%> (-1.45%)	⬇️
jupyterlab_server/tests/test_settings_api.py	100.00% <0.00%> (ø)
jupyterlab_server/settings_handler.py	85.45% <0.00%> (+0.26%)	⬆️

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