[Enhancement] Optimize the gradle build script

[ruanwenjun]

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

Enhancement Request

Right now, we use gradle as the build tool. We create the distribution by copy the jar to target directory, this is not a good way, maybe we can use the assembly/distribution plugin to do this work like maven. I am not sure if gradle has this plugin.

Describe the solution you'd like

Use assembly plugin to create the distribution.

Are you willing to submit PR?

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