New ypy-lib0 package

[davidbrochart]

The (de)serialization functions in yutils.py are generic and could be used for other transports than WebSockets. In Yjs they are part of the lib0 library.
Should we create a new ypy-lib0 repo in this organization?

cc @dmonad

[davidbrochart]

@Horusiath do you think we should have a Rust implementation of lib0, and Python bindings for it?

[Horusiath]

Tbh. lib0 is very small library in Rust (unlike its counterpart in JS due to differences in standard library capabilities of both languages). From Rust side it's mostly about encoding/decoding variable length integers + serialisation of Any object. I don't know how much of a work it'll be in supporting this as a python wrapper over Rust library vs. simply implementing these functions directly in Python.

[davidbrochart]

I was not aware it already exists in Rust.
We already have them in Python, but I think it would make sense to use a faster implementation, and also it should be extracted out of ypy-websocket.
@Waidhoferj do you think Python bindings for the Rust implementation would be easy?