Node endpoints (#1778)

## Issue Addressed

`node` endpoints in #1434

## Proposed Changes

Implement these:
```
 /eth/v1/node/health
 /eth/v1/node/peers/{peer_id}
 /eth/v1/node/peers
```
- Add an `Option<Enr>` to `PeerInfo`
- Finish implementation of `/eth/v1/node/identity`

## Additional Info
- should update the `peers` endpoints when #1764 is resolved



Co-authored-by: realbigsean <seananderson33@gmail.com>

beacon_node/eth2_libp2p/src/peer_manager/mod.rs

@@ -29,7 +29,7 @@ mod peer_sync_status;
 mod peerdb;
 pub(crate) mod score;
 
-pub use peer_info::{PeerConnectionStatus::*, PeerInfo};
+pub use peer_info::{ConnectionDirection, PeerConnectionStatus, PeerConnectionStatus::*, PeerInfo};
 pub use peer_sync_status::{PeerSyncStatus, SyncInfo};
 use score::{PeerAction, ScoreState};
 use std::collections::HashMap;
@@ -623,16 +623,18 @@ impl<TSpec: EthSpec> PeerManager<TSpec> {
                 slog::crit!(self.log, "Connection has been allowed to a banned peer"; "peer_id" => peer_id.to_string());
             }
 
+            let enr = self.discovery.enr_of_peer(peer_id);
+
             match connection {
                 ConnectingType::Dialing => {
-                    peerdb.dialing_peer(peer_id);
+                    peerdb.dialing_peer(peer_id, enr);
                     return true;
                 }
                 ConnectingType::IngoingConnected { multiaddr } => {
-                    peerdb.connect_outgoing(peer_id, multiaddr)
+                    peerdb.connect_outgoing(peer_id, multiaddr, enr)
                 }
                 ConnectingType::OutgoingConnected { multiaddr } => {
-                    peerdb.connect_ingoing(peer_id, multiaddr)
+                    peerdb.connect_ingoing(peer_id, multiaddr, enr)
                 }
             }
         }