something wrong in generating project with Alibaba Sentinel

[ryan-buu]

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Describe the bug
When I'm generating a project with the Alibaba Sentinel, I believe the Dubbo annotation "@reference" should not appear. Additionally, there's an unnecessary class named "FooService" present in the wrong package path "com.alibaba.cloud.demo.sentinel.api". Should I create a PR to fix it?

To Reproduce
Steps to reproduce the behavior:

1. Go to 'https://start.aliyun.com'
2. Check in 'Spring Cloud Alibaba Sentinel'
3. Click "Download source code"

Expected behavior

1. The Dubbo annotation "@reference" should not appear in "{{basePackage}}.demos.sentinel"
2. The class named "FooService" is not needed.

Screenshots

Additional context
Add any other context about the problem here.
e.g. start.aliyun.com website or open source version

[ryan-buu]

pr: #88