benchmark: test performance cost of re-creating schema

Replicates graphql/graphql-js@c7d7026

Author: Cito

tests/benchmarks/test_graphql_schema.py

@@ -0,0 +1,11 @@
+from graphql import GraphQLSchema, build_schema, print_schema
+
+from ..fixtures import big_schema_sdl  # noqa: F401
+
+
+def test_recreate_a_graphql_schema(benchmark, big_schema_sdl):  # noqa: F811
+    schema = build_schema(big_schema_sdl, assume_valid=True)
+    recreated_schema: GraphQLSchema = benchmark(
+        lambda: GraphQLSchema(**schema.to_kwargs())
+    )
+    assert print_schema(schema) == print_schema(recreated_schema)