As of 4.2, we're supporting CompletableFuture for MVC handler methods and message handler methods, but its sibling CompletionStage only for MVC handler methods. Let's fix this gap for 4.3.7, supporting CompletionStage return types there as well, and document that support for both kinds of handler methods.
#16821 Support CompletableFuture as return value in @MessageMapping handlers
#17198 Support CompletableFuture as alternative to DeferredResult in MVC
#19964 Async annotation should allow for non-blocking execution with CompletableFuture
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