Add dubbo-admin swagger generate

[2456868764]

What is the purpose of the change

Add dubbo-admin swagger generate

Brief changelog

make help

dubbo-admin-swagger-gen Generate dubbo-admin swagger docs. dubbo-admin-swagger-ui Generate dubbo-admin swagger docs and start swagger ui.

and access dubbo-admin swagger ui : http://127.0.0.1:38081/swagger/index.html

Verifying this change

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• [ ] Write a pull request description that is detailed enough to understand what the pull request does, how, and why.
• [ ] Write necessary unit-test to verify your logic correction, more mock a little better when cross module dependency exist.
• [ ] Run `mvn clean compile --batch-mode -DskipTests=false -Dcheckstyle.skip=false -Drat.skip=false -Dmaven.javadoc.skip=true to make sure basic checks pass.

[sonarcloud[bot]]

Kudos, SonarCloud Quality Gate passed!   

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