Make it possible to support different version of Pyodide

[fpliger]

Users should be able to use different versions of Pyodide, either from CDN or locally build.

[MarcSkovMadsen]

It would be nice to specify a python version also.

It would be nice to import a minimum python distribution with a fast load time that enables importing pure python packages. To enable fast load times for simple use cases.

[fpliger]

@MarcSkovMadsen agree with you. With that said, for now, I don't think there's much PyScript can do until we are able to support other runtimes/languages entirely. THis means that, for now, the problem is upstream and will need to evolve as Pyodide and CPython on wasm evolve and build better support for this.

So, for now, I'd consider these 2 things as separate issues. (just to make it easier to make progress will stuck on the other)