Extensible toolbar

[jtpio]

Problem

Currently it looks like jupyter-chat does not provide the ability to stop message streaming. Or a way to provide streaming functionality from another extension.

Proposed Solution

JupyterAI v2 seems to be supporting this via jupyterlab/jupyter-ai#1022

This would likely require porting some of the work originally done in jupyterlab/jupyter-ai#1022.

Probably jupyter-chat should only focus on providing the "Stop" button, and a way to customize behavior on stop via plugins.

Additional context

Currently Jupyter AI v3 (in dev) does not seem to be supporting that:

[brichet]

I don't know if we should include the stop button in jupyter-chat, it seems to be only useful when using LLM with streaming.

A more generic way could be to have an extensible toolbar.

[jtpio]

A more generic way could be to have an extensible toolbar.

Yes, after thinking more about it that would make more sense, and be totally fine to add the button in an extension.