chore: import upstream snapshot with attribution

python/ray/types.py

@@ -0,0 +1,14 @@
+from typing import Generic, TypeVar
+
+from ray.util.annotations import PublicAPI
+
+T = TypeVar("T")
+
+
+# TODO(ekl) this is a dummy generic ref type for documentation purposes only.
+# We should try to make the Cython ray.ObjectRef properly generic.
+# NOTE(sang): Looks like using Generic in Cython is not currently possible.
+# We should update Cython > 3.0 for this.
+@PublicAPI
+class ObjectRef(Generic[T]):
+    pass