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This commit upgrades the current gossipsub implementation to support the [v1.1 spec](https://github.com/libp2p/specs/blob/master/pubsub/gossipsub/gossipsub-v1.1.md). It adds a number of features, bug fixes and performance improvements. Besides support for all new 1.1 features, other improvements that are of particular note: - Improved duplicate LRU-time cache (this was previously a severe bottleneck for large message throughput topics) - Extended message validation configuration options - Arbitrary topics (users can now implement their own hashing schemes) - Improved message validation handling - Invalid messages are no longer dropped but sent to the behaviour for application-level processing (including scoring) - Support for floodsub, gossipsub v1 and gossipsub v2 - Protobuf encoding has been shifted into the behaviour. This has permitted two improvements: 1. Message size verification during publishing (report to the user if the message is too large before attempting to send). 2. Message fragmentation. If an RPC is too large it is fragmented into its sub components and sent in smaller chunks. Additional Notes The peer eXchange protocol defined in the v1.1 spec is inactive in its current form. The current implementation permits sending `PeerId` in `PRUNE` messages, however a `PeerId` is not sufficient to form a new connection to a peer. A `Signed Address Record` is required to safely transmit peer identity information. Once these are confirmed (https://github.com/libp2p/specs/pull/217) a future PR will implement these and make PX usable. Co-authored-by: Max Inden <mail@max-inden.de> Co-authored-by: Rüdiger Klaehn <rklaehn@protonmail.com> Co-authored-by: blacktemplar <blacktemplar@a1.net> Co-authored-by: Rüdiger Klaehn <rklaehn@gmail.com> Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com> Co-authored-by: Roman S. Borschel <roman@parity.io> Co-authored-by: Roman Borschel <romanb@users.noreply.github.com> Co-authored-by: David Craven <david@craven.ch>