Limeade hot reloading: code hosting backend and pythonrc

[gabriel-v]

As mentioned in https://github.com/pygame-web/pkg-porting-wasm/issues/5, hot reloading works with limeade.

To make it work for everyone, we should add the functionality in pygbag:

• put hot reloading hook in pythonrc (or as separate new library/wheel for user to import)
• put new API paths (code hosting and changes monitoring) in the pygbag debug HTTP server

see above issue for details and code samples.

Let me know if you think this functionality would go into pygbag, or if you want to keep the library light and keep this functionality external / user-side.

[pmp-p]

i intended to use websocket + an irc in pygbag to allow remote console + REPL on mobile, code editing inside FS object ( pygbag runtime memory )

limeade and https://github.com/breuleux/jurigged seem both good candidates to achieve the code reloading part.

But before getting in that complex i'd like first a simple auto-repackaging when index.html is reloaded.