CUDA Platform Support for XSched

Supported preemption level

Platform	XPU	Shim	Level-1	Level-2	Level-3
CUDA	NVIDIA Ampere GPUs (sm86)	✅	✅	🚧	🚧
	NVIDIA Volta GPUs (sm70)			✅	✅
	NVIDIA Kepler GPUs (sm35)			✅	❌
	Other NVIDIA GPUs			🔘	🔘

Refer to the example.