qh3: QUIC and HTTP/3

qh3 is a lightweight and fast Python library providing a QUIC and HTTP/3 implementation. It is a actively maintained fork of `aioquic`, designed to be embedded into other Python client and server libraries. It focuses on client-side functionality, features a minimal TLS 1.3 implementation, and does not rely on external C/OpenSSL dependencies, instead using a Rust-based cryptography backend. The library maintains a regular release cadence with updates often several times a month.