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Follow up PR of grin#3453. Basic definition of the p2p messages associated with segment request and response of different types. Implemented according to the specification in this WIP RFC. This PR doesn't actually implement handling of these new messages, it simply defines them.
This PR needs to be merged and rebased only after grin#3453 is merged. It should probably be done in a separate new branch which we can use to build the PIBD feature on.