A socket handling library for those running in Tokio environments who wish to use
rust-lightning with native [TcpStream]s.
Designed to be as simple as possible, the high-level usage is almost as simple as "hand over a
[TcpStream] and a reference to a PeerManager and the rest is handled".
The PeerManager, due to the fire-and-forget nature of this logic, must be a reference,
(e.g. an [Arc]) and must use the [SocketDescriptor] provided here as the PeerManager's
SocketDescriptor implementation.
Three methods are exposed to register a new connection for handling in [tokio::spawn] calls;
see their individual docs for details.