chore: import upstream snapshot with attribution

python/semantic_kernel/utils/list_handler.py

@@ -0,0 +1,21 @@
+# Copyright (c) Microsoft. All rights reserved.
+
+
+import asyncio
+from collections.abc import AsyncGenerator, AsyncIterable, Sequence
+from typing import TypeVar
+
+_T = TypeVar("_T")
+
+
+async def desync_list(sync_list: Sequence[_T]) -> AsyncIterable[_T]:  # noqa: RUF029
+    """De synchronize a list of synchronous objects."""
+    for x in sync_list:
+        yield x
+
+
+async def empty_generator() -> AsyncGenerator[_T, None]:
+    """An empty generator, can be used to return an empty generator."""
+    if False:
+        yield None
+    await asyncio.sleep(0)