feat(metrics): add real-time throughput sampling and byte-counting metrics

rust/crates/rustproxy-http/src/lib.rs

@@ -3,12 +3,14 @@
 //! Hyper-based HTTP proxy service for RustProxy.
 //! Handles HTTP request parsing, route-based forwarding, and response filtering.
 
+pub mod counting_body;
 pub mod proxy_service;
 pub mod request_filter;
 pub mod response_filter;
 pub mod template;
 pub mod upstream_selector;
 
+pub use counting_body::*;
 pub use proxy_service::*;
 pub use template::*;
 pub use upstream_selector::*;