Add util method to extract Task ID and Push Notification Config ID from request

Both `GetTaskPushNotificationConfigRequest` and `DeleteTaskPushNotificationConfigRequest` have a `name` field that has the same format: `tasks/{task_id}/pushNotificationConfigs/{config_id}`. Adding here a utility to extract the Task ID and Config ID. Can't output a `types.TaskPushNotificationConfig` as the `PushNotificationConfig` requires a url.

Author: rinaldiangoogle

src/a2a/utils/proto_utils.py

@@ -366,6 +366,26 @@ def task_push_notification_config(
             ),
         )
 
+    @classmethod
+    def task_push_notification_config_params(
+        cls,
+        request: (
+            a2a_pb2.GetTaskPushNotificationConfigRequest
+            | a2a_pb2.DeleteTaskPushNotificationConfigRequest
+        ),
+    ) -> tuple[str, str]:
+        m = _TASK_PUSH_CONFIG_NAME_MATCH.match(request.name)
+        if not m:
+          raise ServerError(
+              error=types.InvalidParamsError(
+                  message=f'No task or config id for {request.name}'
+              )
+          )
+        return (
+            m.group(1),
+            m.group(2),
+        )
+
     @classmethod
     def agent_card(
         cls,