[Enhancement] Extraction of constants [example module tcp directory]

[Alonexc]

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

Enhancement Request

Describe the solution you'd like

Located at:eventmesh-examples/src/main/java/org/apache/eventmesh/tcp/common/EventMeshTestUtils.java Please create a UtilsConstants class in the common directory and extract all the constants from the class EventMeshTestUtils to UtilsConstants.

Are you willing to submit PR?

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