Create network_utils crate (#7761)

Anchor currently depends on `lighthouse_network` for a few types and utilities that live within. As we use our own libp2p behaviours, we actually do not use the core logic in that crate. This makes us transitively depend on a bunch of unneeded crates (even a whole separate libp2p if the versions mismatch!)


  Move things we require into it's own lightweight crate.


Co-Authored-By: Daniel Knopik <daniel@dknopik.de>

beacon_node/lighthouse_network/src/discovery/mod.rs

@@ -4,7 +4,6 @@
 //! queries and manages access to the discovery routing table.
 
 pub(crate) mod enr;
-pub mod enr_ext;
 
 // Allow external use of the lighthouse ENR builder
 use crate::service::TARGET_SUBNET_PEERS;
@@ -12,8 +11,8 @@ use crate::{ClearDialError, metrics};
 use crate::{Enr, NetworkConfig, NetworkGlobals, Subnet, SubnetDiscovery};
 use discv5::{Discv5, enr::NodeId};
 pub use enr::{CombinedKey, Eth2Enr, build_enr, load_enr_from_disk, use_or_load_enr};
-pub use enr_ext::{CombinedKeyExt, EnrExt, peer_id_to_node_id};
 pub use libp2p::identity::{Keypair, PublicKey};
+use network_utils::enr_ext::{CombinedKeyExt, EnrExt, peer_id_to_node_id};
 
 use alloy_rlp::bytes::Bytes;
 use enr::{ATTESTATION_BITFIELD_ENR_KEY, ETH2_ENR_KEY, SYNC_COMMITTEE_BITFIELD_ENR_KEY};
@@ -33,6 +32,7 @@ pub use libp2p::{
 };
 use logging::crit;
 use lru::LruCache;
+use network_utils::discovery_metrics;
 use ssz::Encode;
 use std::num::NonZeroUsize;
 use std::{
@@ -687,7 +687,10 @@ impl<E: EthSpec> Discovery<E> {
                 min_ttl,
                 retries,
             });
-            metrics::set_gauge(&metrics::DISCOVERY_QUEUE, self.queued_queries.len() as i64);
+            metrics::set_gauge(
+                &discovery_metrics::DISCOVERY_QUEUE,
+                self.queued_queries.len() as i64,
+            );
         }
     }
 
@@ -722,7 +725,10 @@ impl<E: EthSpec> Discovery<E> {
             }
         }
         // Update the queue metric
-        metrics::set_gauge(&metrics::DISCOVERY_QUEUE, self.queued_queries.len() as i64);
+        metrics::set_gauge(
+            &discovery_metrics::DISCOVERY_QUEUE,
+            self.queued_queries.len() as i64,
+        );
         processed
     }
 
@@ -1233,7 +1239,7 @@ mod tests {
         let spec = Arc::new(ChainSpec::default());
         let keypair = secp256k1::Keypair::generate();
         let mut config = NetworkConfig::default();
-        config.set_listening_addr(crate::ListenAddress::unused_v4_ports());
+        config.set_listening_addr(network_utils::listen_addr::ListenAddress::unused_v4_ports());
         let config = Arc::new(config);
         let enr_key: CombinedKey = CombinedKey::from_secp256k1(&keypair);
         let next_fork_digest = [0; 4];