Configure Pyolite to have packages automatically installed

Problem

It is currently not possible to automatically install Python packages inside the pyolite kernel.

Proposed Solution

It would be nice to be able to configure Pyolite to include some packages that would automatically be installed with micropip.

cc. @psychemedia who suggested it here https://github.com/jtpio/jupyterlite-demo/pull/7#issuecomment-870144941

Additional context

It might be possible to have it once we use IPython for the execution (see related work https://github.com/jtpio/jupyterlite/pull/171), as it’s possible to configure IPython itself to run code at the shell start.

[bollwyvl]

I feel we need to figure out some way to get these hosted with the build, get the service worker going, use dat/ipfs, etc. before installing more stuff magically. Spamming pypi with requests without any kind of caching isn’t very nice… They probably weren’t signing up to be a static cdn for web page assets.

[jtpio]

@RandomFractals for some libraries it’s a bit trickier as they require patches to be rendered properly in output cells in JupyterLite.

Have you considered optimizing your kernel initialization with just the basics without adding all the other dataviz packages most devs and data scientists might not be using in their pyodide notebooks.

Yes, see #239 as an example. Unfortunately there were some issues with the recursion limit in upstream Pyodide, so the change had to be reverted. But hopefully will come back at some point: #254