chore: import upstream snapshot with attribution

python/ray/cloudpickle/cloudpickle_fast.py

@@ -0,0 +1,14 @@
+"""Compatibility module.
+
+It can be necessary to load files generated by previous versions of cloudpickle
+that rely on symbols being defined under the `cloudpickle.cloudpickle_fast`
+namespace.
+
+See: tests/test_backward_compat.py
+"""
+
+from . import cloudpickle
+
+
+def __getattr__(name):
+    return getattr(cloudpickle, name)