Jupyter server

[brichet]

This PR is a starting point for using labextensions :

• Switch from IpythonHandler from notebook to JupyterHandler from jupyter_server
• Enable jupyter-server and classic notebook server extensions during installation (fix Migrate server extensions to jupyter_server #1465)

[jtpio]

Wondering if we need to stick to 0.5.x for jupyter packaging here.

Or if it could be bumped to a more recent version, for example: jupyter_packaging~=0.12.0

[jtpio]

Also of note, we will probably soon be able to drop jupyter-packaging and switch to hatch (in a later PR):

jupyterlab/frontends-team-compass#146

[brichet]

It's not ready to be merged yet, this version still uses the notebook_dir (notebook server property) instead of root_dir (jupyter server property).
At this point both servers should be usable, it must be possible to choose between these 2 properties.
I will fix this in a future commit.

Edit :
Fixed in 8110193

[brichet]

@jhamrick @BertR @jtpio do you think this PR can be merged ?

[jhamrick]

Looks good to me! Perhaps @jtpio can take another look as well before merging.

[jtpio]

Nice thanks @brichet!

[jtpio]

Also, do we already test that the extensions are loaded and enabled on CI?

Otherwise maybe we should add a check on CI that runs jupyter server extension list and check the extensions are correctly listed?

[brichet]

Also, do we already test that the extensions are loaded and enabled on CI?

Otherwise maybe we should add a check on CI that runs jupyter server extension list and check the extensions are correctly listed?

No, there is no test on the installation and activation of extensions yet. We may add it.