Reactive infrastructure for annotated method invocation in spring-messaging [SPR-17455]

[spring-projects-issues]

Rossen Stoyanchev opened SPR-17455 and commented

Non-blocking, reactive contract equivalents for:

• InvocableHandlerMethod and related contracts for resolving method parameters and handling return values.
• AbstractMethodMessageHandler and sub-classes for message handling through the invocation of annotated handler methods.
• Implementations of argument resolvers and return value handlers, including use of codecs for payload encoding and decoding.

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Affects: 5.1.2

This issue is a sub-task of #21292