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Issue: RocketMQ PollableMessageSource fails to convert JSON payloads and lacks anonymous group support

Issue: RocketMQ PollableMessageSource fails to convert JSON payloads and lacks anonymous group support: a task in LegoFlow-SWE (Harbor dataset). Description When using a PollableMessageSource with the RocketMQ binder (Spring Cloud Stream), two problems occur:

The task

**Description** When using a `PollableMessageSource` with the RocketMQ binder (Spring Cloud Stream), two problems occur:

Part of Lego-X/LegoFlow-SWE.