P2P interface

The Charon P2P interface loosely follows the Eth2 beacon P2P interface.

• Transport: TCP over IPv4/IPv6.
• Identity: Ethereum Node Records.
• Handshake: noise-libp2p with secp256k1 keys.
  • Each charon client must have their ENR public key authorized in a cluster.lock file in order for the client handshake to succeed.
• Discovery: Discv5.