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* Refine error reporting for inbound request handling. At the moment one can neither get confirmation when a response has been sent on the underlying transport, nor is one aware of response omissions. The latter was originally intended as a feature for support of one-way protocols, which seems like a bad idea in hindsight. The lack of notification for sent responses may prohibit implementation of some request-response protocols that need to ensure a happens-before relation between sending a response and a subsequent request, besides uses for collecting statistics. Even with these changes, there is no active notification for failed inbound requests as a result of connections unexpectedly closing, as is the case for outbound requests. Instead, for pending inbound requests this scenario can be identified if necessary by the absense of both `InboundFailure` and `ResponseSent` events for a particular previously received request. Interest in this situation is not expected to be common and would otherwise require explicitly tracking all inbound requests in the `RequestResponse` behaviour, which would be a pity. `RequestResponse::send_response` now also synchronously returns an error if the inbound upgrade handling the request has been aborted, due to timeout or closing of the connection, giving more options for graceful error handling for inbound requests. As an aside, the `Throttled` wrapper now no longer emits inbound or outbound error events occurring in the context of sending credit requests or responses. This is in addition to not emitting `ResponseSent` events for ACK responses of credit grants. * Update protocols/request-response/src/lib.rs Co-authored-by: Max Inden <mail@max-inden.de> * Address some minor clippy warnings. (#1868) * Track pending credit request IDs. In order to avoid emitting events relating to credit grants or acks on the public API. The public API should only emit events relating to the actual requests and responses sent by client code. * Small cleanup * Cleanup * Update versions and changelogs. * Unreleased Co-authored-by: Max Inden <mail@max-inden.de>