Connection timeout does not work as expected

[kayabaNerve]

serai/coordinator/p2p/libp2p/src/lib.rs

Line 206 in be2098d

.with_idle_connection_timeout(ping::INTERVAL + ping::TIMEOUT + Duration::from_secs(5))

sets the connection timeout to be a function of ping. ping explicitly will not keep a connection alive, per libp2p/rust-libp2p#4950 (comment).

We dial peers ourselves and expect the connections to be maintained ad-infinitum, unless the connections actually disconnect (which is observable by ping failing). If a validator is no longer relevant, they'll be banned. Please note this isn't entirely accurate, as we don't necessarily want to accept and maintain an unbounded amount of incoming connections, but it is the correct premise regarding dialed connections.