feat(smart-proxy): add UDP transport support with QUIC/HTTP3 routing and datagram handler relay

rust/crates/rustproxy/tests/common/mod.rs

@@ -269,6 +269,7 @@ pub fn make_test_route(
         id: None,
         route_match: rustproxy_config::RouteMatch {
             ports: rustproxy_config::PortRange::Single(port),
+            transport: None,
             domains: domain.map(|d| rustproxy_config::DomainSpec::Single(d.to_string())),
             path: None,
             client_ip: None,
@@ -288,6 +289,7 @@ pub fn make_test_route(
                 send_proxy_protocol: None,
                 headers: None,
                 advanced: None,
+                backend_transport: None,
                 priority: None,
             }]),
             tls: None,
@@ -298,6 +300,7 @@ pub fn make_test_route(
             forwarding_engine: None,
             nftables: None,
             send_proxy_protocol: None,
+            udp: None,
         },
         headers: None,
         security: None,