http/https proxy (#7600)

* add http(s) proxy

* Add front-end translation

* fix ui description

* For linux platform, add rustls support

* fix: Fix the proxy address test function.

* add: Added default prompts for agency agreement and some multi-language translations

* add: Http proxy request client

* fix: add async http proxy func and format the code

* add: Preliminary support for flutter front-end calling rust back-end http request

* Optimize HTTP calls

* Optimize HTTP calls

* fix: Optimize HTTP requests, refine translations, and fix dependencies

libs/hbb_common/src/lib.rs

@@ -16,6 +16,7 @@ use std::{
 };
 pub use tokio;
 pub use tokio_util;
+pub mod proxy;
 pub mod socket_client;
 pub mod tcp;
 pub mod udp;
@@ -51,6 +52,7 @@ pub use serde_json;
 pub use sysinfo;
 pub use toml;
 pub use uuid;
+pub use base64;
 pub use thiserror;
 
 #[cfg(feature = "quic")]