feat(compat): GRPC server with client 0.3 compatibility.

Author: bartek-w

src/a2a/compat/v0_3/conversions.py

@@ -1123,6 +1123,13 @@ def to_core_get_task_push_notification_config_request(
     compat_req: types_v03.GetTaskPushNotificationConfigRequest,
 ) -> pb2_v10.GetTaskPushNotificationConfigRequest:
     """Convert get task push notification config request to v1.0 core type."""
+    if isinstance(
+        compat_req.params, types_v03.GetTaskPushNotificationConfigParams
+    ):
+        return pb2_v10.GetTaskPushNotificationConfigRequest(
+            task_id=compat_req.params.id,
+            id=compat_req.params.push_notification_config_id,
+        )
     return pb2_v10.GetTaskPushNotificationConfigRequest(
         task_id=compat_req.params.id
     )