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74f31f1266
Enable a `NetworkBehaviour` or a user via `Swarm::dial` to override the dial concurrency factor per dial. This is especially relevant in the case of libp2p-autonat where one wants to probe addresses in sequence to reduce the amount of work a remote peer can force onto the local node. To enable the above, this commit also: - Introduces `libp2p_core::DialOpts` mirroring `libp2p_swarm::DialOpts`. Passed as an argument to `Network::dial`. - Removes `Peer::dial` in favor of `Network::dial`. - Simplifies `Swarm::dial_with_handler`. The introduction of `libp2p_core::DialOpts` will be useful beyond this feature, e.g. for https://github.com/libp2p/rust-libp2p/pull/2363. In the long run I would like to move and merge `libp2p_core::Network` and `libp2p_core::Pool` into `libp2p_swarm::Swarm` thus deduplicating `libp2p_core::DialOpts` and `libp2p_swarm::DialOpts`. Fixes #2385.