ref: update the build system to use hatch and update dependency versions

[horw]

The Jupyter build system was outdated, so this kernel needs to be migrated to the Hatch build system, which supports shareable files. On the other hand, JupyterLite has been significantly updated, with many new features now available.

The base for this PR was https://github.com/jupyterlite/pyodide-kernel, as it seemed to have been updated quite recently. However, it's too complicated, which is where echo-kernel shines — it provides an easy, not-overwhelming template example.

How to Start Dev Server

npm run setup:py
jlpm install
jlpm build
jupyter labextension develop . --overwrite
jupyter lite serve

Further Steps

• update Readme
• It's quite annoying and misleading to change all echo-kernel and pythonlite-echo-kernel related strings manually. We need to think about how to manage them in one place, as there is too much duplication.

Related

Closes #8

[horw]

I guess this file handlers.py isn't needed now?

[horw]

@jtpio Hello!
What do you think about this migration? Any advice or suggestions for further steps to improve it would be great.
Thanks! Waiting for your response.

[jtpio]

Thanks @horw for cleaning this up!

Indeed the repo is a bit outdated.

[jtpio]

Thanks for working on this!

Left a couple of comments, which will hopefully help with the CI too.

[jtpio]

Looks like we can now update to ^0.5.0? https://github.com/jupyterlite/jupyterlite/releases/tag/v0.5.0

[jtpio]

Looks like this setup.py file can now be simplified if most of the build logic is handled in pyproject.toml, like in the extension template: https://github.com/jupyterlab/extension-template

[jtpio]

So we can likely replace it by the following:

__import__("setuptools").setup()