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Concurrently dial address candidates within a single dial attempt. Main motivation for this feature is to increase success rate on hole punching (see https://github.com/libp2p/rust-libp2p/issues/1896#issuecomment-885894496 for details). Though, as a nice side effect, as one would expect, it does improve connection establishment time. Cleanups and fixes done along the way: - Merge `pool.rs` and `manager.rs`. - Instead of manually implementing state machines in `task.rs` use `async/await`. - Fix bug where `NetworkBehaviour::inject_connection_closed` is called without a previous `NetworkBehaviour::inject_connection_established` (see https://github.com/libp2p/rust-libp2p/issues/2242). - Return handler to behaviour on incoming connection limit error. Missed in https://github.com/libp2p/rust-libp2p/issues/2242.