[docs]: translate hertz/tutorials/framework-exten/advanced-exten/protocol/

[Duslia]

protocol: zh web page：https://www.cloudwego.io/zh/docs/hertz/tutorials/framework-exten/advanced-exten/protocol/ zh doc：https://github.com/cloudwego/cloudwego.github.io/blob/main/content/zh/docs/hertz/tutorials/framework-exten/advanced-exten/protocol.md en folder：https://github.com/cloudwego/cloudwego.github.io/tree/main/content/en/docs/hertz/tutorials

Notes:

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[Skyenought]

I will translate for this.

[Duslia]

Well done!