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2a3eaf4d7e
Makes `Clone` calls significantly cheaper as now only the outer Arc is cloned (the inner ones have been removed). Also wraps uses of Serai in an Arc as we shouldn't actually need/want multiple caller connection pools.
Serai Coordinator libp2p P2P
A libp2p-backed P2P instantiation for Serai's coordinator.
The libp2p swarm is limited to validators from the Serai network. The swarm does not maintain any of its own peer finding/routing infrastructure, instead relying on the Serai network's connection information to dial peers. This does limit the listening peers to only the peers immediately reachable via the same IP address (despite the two distinct services), not hidden behind a NAT, yet is also quite simple and gives full control of who to connect to to us.
Peers are decided via the internal DialTask which aims to maintain a target
amount of peers for each external network. This ensures cosigns are able to
propagate across the external networks which sign them.