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/transport/middle_proxy/send.rs

@@ -1,3 +1,5 @@
+#![allow(clippy::too_many_arguments)]
+
 use std::cmp::Reverse;
 use std::collections::{HashMap, HashSet};
 use std::net::SocketAddr;
@@ -593,7 +595,7 @@ impl MePool {
 
         let round = *hybrid_recovery_round;
         let target_triggered = self.trigger_async_recovery_for_target_dc(routed_dc).await;
-        if !target_triggered || round % HYBRID_GLOBAL_BURST_PERIOD_ROUNDS == 0 {
+        if !target_triggered || round.is_multiple_of(HYBRID_GLOBAL_BURST_PERIOD_ROUNDS) {
             self.trigger_async_recovery_global().await;
         }
         *hybrid_recovery_round = round.saturating_add(1);
@@ -672,7 +674,7 @@ impl MePool {
             if !self.writer_eligible_for_selection(w, include_warm) {
                 continue;
             }
-            if w.writer_dc == routed_dc && preferred.iter().any(|endpoint| *endpoint == w.addr) {
+            if w.writer_dc == routed_dc && preferred.contains(&w.addr) {
                 out.push(idx);
             }
         }