[Enhancement] Clean up some useless constants and classes

[Alonexc]

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• [X] I had searched in the issues and found no similar issues.

Enhancement Request

Clean up some useless constants and classes in the eventmesh-connector-plugin module.

Describe the solution you'd like

located in:eventmesh-connector-plugin/eventmesh-connector-rocketmq/src/main/java/org/apache/eventmesh/connector/rocketmq/common The Constants and EventMeshContants classes in this package have a large number of unused Constants,we can remove them.

eventmesh-connector-plugin/eventmesh-connector-rocketmq/src/main/java/org/apache/eventmesh/connector/rocketmq/domain/NonStandardKeys.java There are unused keys in this class

ConsumeRequest and RocketMQConstants, under the same package, are not used.

eventmesh-connector-plugin/eventmesh-connector-rocketmq/src/main/java/org/apache/eventmesh/connector/rocketmq/promise/FutureState.java This class is useless, so we can remove this package and this class.

Are you willing to submit PR?

• [ ] Yes I am willing to submit a PR!

[Witness167]

Hi,

I would like to work on this issue. Thanks!

[Alonexc]

@Witness167 Ok, welcome!

[xwm1992]

@Witness167 How is the progress of this issue ?

[captainbkarthick]

@qqeasonchen , Looks like the fix for this issue is merged. Requesting to check and close the issue.