Rust wrapper for Breezy

This crate contains a rust wrapper for the Breezy API, which is written in Python.

Breezy itself is being ported to Rust, but until that port has completed, this crate allows access to the most important Breezy APIs via Rust.

The Rust API here will follow the Breezy 4.0 Rust API as much as possible, to make porting easier.