peerStore[AddressBook] missing remote endpoints of established connection.

[cheatfate]

Current version of peerStore[AddressBook] holds only addresses which was announced by the peer itself during identify phase, but did not holds remote peer address of currently established connections.
For example nim-libp2p holds this data for fully connected peer via Internet.

/ip4/10.81.2.114/tcp/32502, /ip4/127.0.0.1/tcp/32502, /ip4/10.81.2.114/udp/32503/quic-v1, /ip4/127.0.0.1/udp/32503/quic-v1

As you can see there is no globally routable IP addresses available, which i think is incorrect.

[diegomrsantos]

This can be achieved using

nim-libp2p/libp2p/stream/connection.nim

Line 35 in dc83a1e

observedAddr*: Opt[MultiAddress]

[cheatfate]

Connection object is NOT easily accessible and needs to be accounted in nimbus-eth2 to properly access this value, its an overhead for application, imho. This functionality should be accessible via peerStore.