Fix experimental.utils submodule access and test_device_id

[UNTESTED] Make utils accessible as cuda.core.experimental.utils submodule
for backward compatibility. Also fix test_device_id to use cuda.core.system
instead of cuda.core.experimental.system.

Author: rwgk

cuda_core/cuda/core/experimental/__init__.py

@@ -64,6 +64,8 @@ def _warn_deprecated():
 _warn_deprecated()
 
 from cuda.core import utils  # noqa: E402
+# Make utils accessible as a submodule for backward compatibility
+__import__("sys").modules[__spec__.name + ".utils"] = utils
 from cuda.core._device import Device  # noqa: E402
 from cuda.core._event import Event, EventOptions  # noqa: E402
 from cuda.core._graph import (  # noqa: E402

cuda_core/tests/test_device.py

@@ -48,7 +48,7 @@ def test_device_alloc(deinit_cuda):
 
 
 def test_device_id(deinit_cuda):
-    for device in cuda.core.experimental.system.devices:
+    for device in cuda.core.system.devices:
         device.set_current()
         assert device.device_id == handle_return(runtime.cudaGetDevice())