[ISSUE #826] Add RmqSinkTask

[Git-Yang]

What is the purpose of the change

#826

Brief changelog

• Add RmqSinkTask.
• RmqSourceTask adds schema field.

Verifying this change

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[duhenglucky]

At first，the origin design is use the target cluster as connector host cluster,In this way, messages can be directly synchronized to another cluster without going through a sink task, and a native format converter is provided in the replicator

[Git-Yang]

At first，the origin design is use the target cluster as connector host cluster,In this way, messages can be directly synchronized to another cluster without going through a sink task, and a native format converter is provided in the replicator

First of all, thank you for your answer. What you mean is that the read message is directly written to the local cluster (while serving as the target cluster) through RocketMQConverter. I also agree with this approach. My original intention of adding WorkerDirectTask and RmqSinkTask was to follow the design philosophy of openmessage and reduce intermediate storage. Do you think it makes sense?

[Git-Yang]

The offsetMsgId is added to the keys, which can be used for message offset checking.