jupyter_bokeh 4.0.0

[mattpap]

This is preparatory PR for jupyter_bokeh 3.0.8 release. The main change is support for jupyterlab 4 (Python side). Base on my testing, this soft of works, i.e. plots/layouts appear, however handles don't work and thus there's no interactivity.

[scimax]

Hi @mattpap , I just came across your PR because I experienced the same issue as stated in #195 . However, since you mention that the handles don't work anymore in your case, I was a bit confused.
I had a running instance of jupyterlab 4 still open while i was installing jupyter_bokeh 3.0.7. During the installation, jupyterlab was downgraded, but not the current instance, since it was still running. Then I imported bokeh in the open notebook and it worked. Doesn't that mean that theoretically jupyter_bokeh 3.0.7. is compatible with jupyterlab 4.x? Interactivity was working.
Or do I misinterpret something here in my observations?

So the main question I wanted to ask: could it be that the lack of interactivity was something platform-specific?

[bryevdv]

@scimax "handles" refers specifically to the old push_notebook API, is that what you were using? "Bokeh app embedded in a notebook" is a different kind of usage that does not involve handles.

[philippjfr]

I've updated this PR to build against JupyterLab 4 now which included:

• Updating the package.json with latest Jupyter packages
• Replace setup.py and previous jupyter packaging approach with modern Jupyter tooling based on hatch(ling)
• Some typing changes.

[philippjfr]

@mattpap Would you mind testing and then releasing?

[bryevdv]

Please just update the README with a few lines how to build/deploy using the new system

[philippjfr]

Nothing should have changed on that front, but @mattpap when you get a chance do document the deployment process.