feat(swarm): remove deprecated IntoConnectionHandler

This removes the deprecated `IntoConnectionHandler` trait and all its implementations. Consequently, `NetworkBehaviour::new_handler` and `NetworkBehaviour::addresses_of_peer` are now gone and the two `handle_` functions are now required to implement.

Related: #3647.

Pull-Request: #3884.

protocols/identify/src/behaviour.rs

@@ -167,9 +167,6 @@ impl Config {
     }
 
     /// Configures the size of the LRU cache, caching addresses of discovered peers.
-    ///
-    /// The [`Swarm`](libp2p_swarm::Swarm) may extend the set of addresses of an outgoing connection attempt via
-    ///  [`Behaviour::addresses_of_peer`].
     pub fn with_cache_size(mut self, cache_size: usize) -> Self {
         self.cache_size = cache_size;
         self

protocols/rendezvous/src/client.rs

@@ -47,7 +47,7 @@ pub struct Behaviour {
 
     /// Hold addresses of all peers that we have discovered so far.
     ///
-    /// Storing these internally allows us to assist the [`libp2p_swarm::Swarm`] in dialing by returning addresses from [`NetworkBehaviour::addresses_of_peer`].
+    /// Storing these internally allows us to assist the [`libp2p_swarm::Swarm`] in dialing by returning addresses from [`NetworkBehaviour::handle_pending_outbound_connection`].
     discovered_peers: HashMap<(PeerId, Namespace), Vec<Multiaddr>>,
 
     /// Tracks the expiry of registrations that we have discovered and stored in `discovered_peers` otherwise we have a memory leak.

protocols/request-response/src/lib.rs

@@ -417,7 +417,7 @@ where
 
     /// Adds a known address for a peer that can be used for
     /// dialing attempts by the `Swarm`, i.e. is returned
-    /// by [`NetworkBehaviour::addresses_of_peer`].
+    /// by [`NetworkBehaviour::handle_pending_outbound_connection`].
     ///
     /// Addresses added in this way are only removed by `remove_address`.
     pub fn add_address(&mut self, peer: &PeerId, address: Multiaddr) {