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* Custom DLQ Destination Resolver Allow applications to provide a custom DLQ destination resolver implementaiton by providing a new interface DlqDestinationResolver as part of binder's public contract. This interface is a BiFunction extension using which the applications can provide more fine grained control over where to route records in error. Adding test to verify. Adding docs. Resolves https://github.com/spring-cloud/spring-cloud-stream-binder-kafka/issues/966 * Add DlqDestinationResolver to MessageChannel based binder. Tests and docs