feat: add receive all the metainfo api

[Zzhiter]

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feat: add receive all the metainfo api

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添加client端获取所有metainfo的API

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en: zh(optional): 最近在开发kitexcall工具的过程中，使用到这个方法，但是发现例子里和官方文档并没有同步展示

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[GuangmingLuo]

cc @felix021