* additive quic transport, off by default (--quic-support)
* add QuicConf + QuicConfBuilder, --quic-support / --quic-port flags
* net_config announces quic-v1 host/ext/dns4 addrs, adds quic-v1 to enr multiaddrs
* newWakuSwitch mounts quic transport when a quic addr is set
* toRemotePeerInfo: quic from enr multiaddrs ext, sorted quic-first
* BoundPorts.quic, read back the bound quic port at start (handles --quic-port=0)
* skip auto quic addr when operator supplies one via --ext-multiaddr
* tests: nodes dual-stack by default, tcp-only where single transport asserted
* tests: drop hardcoded ephemeral ports (port 0) to fix quic-churn bind flakes
* use setupNat to discover NAT-mapped UDP port when QUIC enabled
