Add basic p2p package for avs node communication

[samlaf]

Some AVSs might need to communicate via p2p network. Let's just write a simple implementation, probably using libp2p. Have a look at the avalanche and optimism implementations for examples.

[wesfloyd]

Fwiw - I agree libp2p or a similar messaging technology (NATS, iroh) could be a valuable add for standard AVS architectures., potentially removing the need for an aggregator node. We used a modified form of libp2p for operator node comms in my last project web3 compute project Bacalhau, to avoid the need for a centralized aggregator.