Noq: n0's new QUIC implementation in Rust

n0 team announced noq, their own general-purpose QUIC implementation in Rust with multipath and NAT traversal support, which has been powering iroh since v0.96. Originally a soft fork of Quinn, it evolved into a hard fork due to diverging development needs around QUIC multipath, NAT traversal, and relay-as-a-path architecture. noq features a full QUIC Multipath spec implementation where multiple paths (relay, direct UDP) are first-class QUIC concepts with per-path congestion state, along with QUIC NAT traversal support.