Refactor proxy and transport modules for improved safety and performance

- Enhanced linting rules in `src/proxy/mod.rs` to enforce stricter code quality checks in production.
- Updated hash functions in `src/proxy/middle_relay.rs` for better efficiency.
- Added new security tests in `src/proxy/tests/middle_relay_stub_completion_security_tests.rs` to validate desynchronization behavior.
- Removed ignored test stubs in `src/proxy/tests/middle_relay_security_tests.rs` to clean up the test suite.
- Improved error handling and code readability in various transport modules, including `src/transport/middle_proxy/config_updater.rs` and `src/transport/middle_proxy/pool.rs`.
- Introduced new padding functions in `src/stream/frame_stream_padding_security_tests.rs` to ensure consistent behavior across different implementations.
- Adjusted TLS stream validation in `src/stream/tls_stream.rs` for better boundary checking.
- General code cleanup and dead code elimination across multiple files to enhance maintainability.

src/tls_front/emulator.rs

@@ -1,3 +1,5 @@
+#![allow(clippy::too_many_arguments)]
+
 use crate::crypto::{SecureRandom, sha256_hmac};
 use crate::protocol::constants::{
     MAX_TLS_CIPHERTEXT_SIZE, TLS_RECORD_APPLICATION, TLS_RECORD_CHANGE_CIPHER,

src/tls_front/fetcher.rs

@@ -1,3 +1,5 @@
+#![allow(clippy::too_many_arguments)]
+
 use std::sync::Arc;
 use std::time::Duration;
 
@@ -810,7 +812,8 @@ mod tests {
     #[test]
     fn test_encode_tls13_certificate_message_single_cert() {
         let cert = vec![0x30, 0x03, 0x02, 0x01, 0x01];
-        let message = encode_tls13_certificate_message(&[cert.clone()]).expect("message");
+        let message = encode_tls13_certificate_message(std::slice::from_ref(&cert))
+            .expect("message");
 
         assert_eq!(message[0], 0x0b);
         assert_eq!(read_u24(&message[1..4]), message.len() - 4);