Track peer address in UDP bind registration#7
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Extend the bind_addrs HashSet key from (protocol, local) to (protocol, local, Option<peer>) via a new BindKey type alias, and add a matching peer field to BindAddr. - add_bind_addr / remove_bind_addr take a peer: Option<SocketAddr>. - IpStack::bind takes a peer argument; bind_ip passes None. - BindAddr gains set_peer to re-key an entry with a new peer. - UdpSocket::bind0 forwards peer_addr; connect calls set_peer. - TcpListener/TcpStream bind calls pass None.
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Include the peer address in the bind-address key so multiple UDP sockets can bind to the same local address with distinct peers. Add BindAddr::set_peer to update the registration when a socket's peer is established via connect or bind0.