[router] Impl radix tree and set up CI (#1893)

Co-authored-by: Lianmin Zheng <lianminzheng@gmail.com>

rust/src/main.rs

@@ -1,9 +1,10 @@
 // src/main.rs
-use clap::Parser;
 use clap::builder::PossibleValuesParser;
+use clap::Parser;
 // declare child modules
-mod server;
 mod router;
+mod server;
+mod tree;
 
 #[derive(Parser, Debug)]
 #[command(author, version, about, long_about = None)]
@@ -25,4 +26,4 @@ struct Args {
 async fn main() -> std::io::Result<()> {
     let args = Args::parse();
     server::startup(args.host, args.port, args.worker_urls, args.policy).await
-}
+}