add new benchmark pytest mark

Author: abrookins

tests/conftest.py

@@ -374,6 +374,10 @@ def pytest_configure(config: pytest.Config) -> None:
         "markers",
         "requires_api_keys: mark test as requiring API keys",
     )
+    config.addinivalue_line(
+        "markers",
+        "benchmark: mark test as a benchmark test",
+    )
     config.addinivalue_line(
         "markers",
         "integration: mark test as an integration test (requires running memory server)",