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Ⅰ. Describe what this PR did
添加proxy cache插件
Ⅱ. Does this pull request fix one issue?
fixes: #679
Ⅲ. Why don't you add test cases (unit test/integration test)?
稍后提供
Ⅳ. Describe how to verify it
补充所有测试后ci pass
Ⅴ. Special notes for reviews
有两个TODO,需要确认一下,方便进行后续开发,比较重要的点就是用户删除插件后,需要对内存或者磁盘进行一个清理