Release jupyter-ydoc v3.0.0 final

[davidbrochart]

I'm planning to release jupyter-ydoc v3.0.0 final before the end of the week.
Please speak now if there are objections.

[jtpio]

Sounds good.

cc @krassowski for awareness, who previously mentioned doing this update before we release JupyterLab 4.3.0 final: jupyterlab/jupyterlab#16649

[krassowski]

A nice to have before final would be addressing the typing issue (#269). We could start by publishing a beta or even RC now.

[davidbrochart]

It looks like addressing #269 will take some time, and that we could release v3.0.0 final without it and add more typing in the future.
Let's release today?

[jtpio]

Sounds good.

For reference, this was discussed during the last Jupyter Frontends call: jupyterlab/frontends-team-compass#251 (comment)

[davidbrochart]

Done: https://github.com/jupyter-server/jupyter_ydoc/releases/tag/v3.0.0.