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Since we want to implement a priority queue later, we need to replace the normal sending channels with the new smart structures first.
UrgentPush allows you to push an rpc packet to the front of the queue so that it will be popped out fast.
Most importantly, this commit adds a new method called PreValidation to the interface PubSubRouter, which will be called right before validating the gossipsub message. In GossipSubRouter, PreValidation will send the IDONTWANT controll messages to all the mesh peers of the topics of the received messages.
When receiving IDONTWANTs, the host should remember the message ids contained in IDONTWANTs using a hash map. When receiving messages with those ids, it shouldn't forward them to the peers who already sent the IDONTWANTs. When the maximum number of IDONTWANTs is reached for any particular peer, the host should ignore any excessive IDONTWANTs from that peer.
If the messages IDs received from IDONTWANTs are older than 3 heartbeats, they should be removed from the IDONTWANT cache.
Rather than keeping the raw message ids, keep their hashes instead to save memory and protect again memory DoS attacks.
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Attempt to continue this PR libp2p#553