feat: racenonce for deduplicating connection attempts #59
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draft/WIP/experiment
This adds a
racenoncetransport parameter. It can be set when initiating connections, viaClientConfig. On the server side, connection attempts which haveracenonceset are rejected if the endpoint has an open connection with the sameracenonce.This can be used to race two or more connection attempts to the same server (over different paths), while making sure that only one of them is accepted.