feat: add shared API operation metadata macro

crates/api-macros/tests/ui/invalid_error_status.rs

@@ -0,0 +1,12 @@
+use api_macros::api;
+
+pub struct Response;
+pub struct PublicError;
+
+#[api]
+pub trait InvalidErrorStatus {
+    #[get("/widgets", error_status = 200)]
+    async fn list(&self) -> Result<Response, PublicError>;
+}
+
+fn main() {}