Add Cuda support. Demonstrate Vulkan/Cuda interop. #17
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There's a lot of things to juggle here.
In particular, in order to enable cuda->vulkan->cuda interop we have to first copy touch's cuda array into exported vulkan memory, and vice versa for output. This is a bit fragile and easy to mess up! Particular care needs to be paid to stuff like differences between vk/cuda alignment in allocations.
But it basically works?