Figure out a solution for the protobuf files

[tomaka]

Right now you have to install cmake in order to compile the protobuf compiler in order to parse a protobuf file at compilation time.
This is really crappy.

Additionally, the auto-generated Rust files have a ton of clippy warnings.

IMO we should do this differently, for example not do any compilation time generation of Rust code, and instead manually generate and parse the encoded payloads. Or include the generated Rust code into the smoldot repo.

[tomaka]

The format isn't very complicated: https://developers.google.com/protocol-buffers/docs/encoding