Check Request and Path in debug_handler (#1035)

* Check `Request` and `Path` in `debug_handler`

* changelog links

* Include errors with the input

axum-macros/tests/debug_handler/fail/multiple_paths.rs

@@ -0,0 +1,7 @@
+use axum::extract::Path;
+use axum_macros::debug_handler;
+
+#[debug_handler]
+async fn handler(_: Path<String>, _: Path<String>) {}
+
+fn main() {}