Move python/jupyterlab-chat to packages/

[dlqqq]

Problem

It's a little strange how python/jupyterlab-chat:

• Shares a similar name to packages/jupyterlab-chat,
• Refers to a NPM package of a different name (jupyterlab-chat-extension), and
• Is under a different directory than the other extensions in this monorepo.

Proposed Solution

Move python/jupyterlab-chat to packages/jupyterlab-chat-extension.

Jupyter AI's monorepo structure allows for Python server extensions under packages/ as well. It uses a custom Jupyter Releaser configuration and Lerna scripts to build & release the packages.

Additional context

It would be nice to solve this issue to make it easier for new contributors to ramp up. However, this is a low priority issue given that it has no user impact.

@brichet Can you share more details about why the repo has a separate python/ folder, and if you think this issue makes sense?

[krassowski]

I do like the separation between python and npm packages as in https://github.com/jupyterlab/jupyter-collaboration. I think it is much easier to reason about.

[brichet]

Agree, maybe we should do like in jupyter-collaboration, keep only the python part in the python directory, and move jupyterlab-chat-extension in packages.