[Enhancement] Use a variable instead of a fixed number

[kirinzhu]

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

Enhancement Request

In eventmesh-runtime/src/main/java/org/apache/eventmesh/runtime/boot/EventMeshGrpcServer.java In the method initHttpClientPool() At line 253

The number of loops should not be fixed

Describe the solution you'd like

Maybe you could use a new variable instead of a fixed number

Are you willing to submit PR?

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