Make compatible with Jupyterlab 4

[mctoohey]

Fixes #14

These changes will not be compatible with Jupyterlab<4

I'm not sure how you want to proceed. Happy to just leave this MR open and continue to maintain it until there is an official release of Jupyterlab 4.0

[github-actions]

👈 Launch a binder notebook on branch mctoohey/jupyterlab-favorites/master

[fcollonval]

Thanks @mctoohey - typically I'll wait for JupyterLab 4.0.0-beta that will have API frozen before merging an upgrade in the main branch.

[mctoohey]

@fcollonval Can we look to merge this in now that Jupyterlab 4.0 has been release? The test_isolated step is failing due to what I believe to be a bug in jupyterlab.browser_check. I will open a PR in that repo for that issue.

[mctoohey]

Was able to fix the failing test by switching from --no-chrome-check to --no-browser-check which is functional the same.

[fcollonval]

Thanks @mctoohey

If it is ok with you I'll build on top of this PR to modernize the code and fix the CI.

[kevinjohncutler]

Super excited to see this almost done, really appreciate it!

[kevinjohncutler]

@fcollonval Is the extension ready for a pypi release with these changes? I have not been able to get a local install to complete.

[kamranesmaeili]

Thanks @fcollonval, same question as @kevinjohncutler here. Any plan regarding the pypi release?

[mctoohey]

Thanks @mctoohey

If it is ok with you I'll build on top of this PR to modernize the code and fix the CI.

Thanks for following up on this @fcollonval and fixing the build!