chore: import upstream snapshot with attribution

python/ray/data/_internal/planner/__init__.py

@@ -0,0 +1,14 @@
+from typing import TYPE_CHECKING
+
+if TYPE_CHECKING:
+    from ray.data._internal.planner.planner import Planner
+
+
+def create_planner() -> "Planner":
+    # Import here to avoid circular import.
+    from ray.data._internal.planner.planner import Planner
+
+    return Planner()
+
+
+__all__ = ["create_planner"]