Support @defer in Federation V2

Author: arunsureshkumar

graphene_mongo/types.py

@@ -232,7 +232,10 @@ def get_node(cls, info, id):
             for field in cls._meta.required_fields:
                 if field in cls._meta.model._fields_ordered:
                     required_fields.append(field)
-            for field in get_query_fields(info):
+            queried_fields = get_query_fields(info)
+            if cls._meta.name in queried_fields:
+                queried_fields = queried_fields[cls._meta.name]
+            for field in queried_fields:
                 if to_snake_case(field) in cls._meta.model._fields_ordered:
                     required_fields.append(to_snake_case(field))
             required_fields = list(set(required_fields))