JIRA: https://jira.spring.io/browse/INT-3672
Previously the `IdempotentReceiverInterceptor` has been applied only for the `MessageHandler`s which were registered with `.handler` suffix.
Rework `IdempotentReceiverAutoProxyCreatorInitializer` and `IdempotentReceiverAutoProxyCreator` to get deal with **direct** `MessageHandler`s
which can be resulted from `@Bean` methods.
Use the `MessageHandler` real bean name instead of `endpoint pattern` in that case
**Cherry-pick to 4.1.x**
f686c21b00