842b424acd
Before this change an @MessageMapping could be matched to any RSocket interaction type, which is arguably too flexible, makes it difficult to reason what would happen in case of a significant mismatch of cardinality, e.g. request for Fire-And-Forget (1-to-0) mapped to a method that returns Flux, and could result in payloads being ignored, or not seen unintentionally. This commit checks @ConnectMapping method on startup and rejects them if they return any values (sync or async). It also refines each @MessageMapping to match only the RSocket interaction type it fits based on the input and output cardinality of the handler method. Subsequently if a request is not matched, we'll do a second search to identify partial matches (by route only) and raise a helpful error that explains which interaction type is actually supported. The reference docs has been updated to explain the options. Closes gh-23999
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