Feat: Cuda Device Properties

[micahcc]

• Add function to get device properties
• There was one breaking change in the cudaDeviceProps struct between cuda 10 and 11 (they inserted persistingL2CacheMaxSize), but other than that they have only added.
• Its nice to have the type defined in rust, because its easier for users, but it may be worth generating the type with bindgen if it gets changed again.

Different versions of cudaDeviceProps struct:

[gerwin3]

Oh so the version in your PR, to which version does it correspond in CUDA exactly?

EDIT: @micahcc And could you also add the padding to it? I think technically without it the struct may be incompatible due to alignment. Also a static check on the size of the struct would be nice :)

[micahcc]

@gerwin3 I think without codegen this might get pretty ugly. I think we would want to make a C version of the cudaDeviceProperties with our own layout and then manually copy each field. That way we can guarantee the memory layout in rust. The cuda versions are listed in the diff view I posted (10, 11.8, 12.8).

I'm fine doing the grunt work of doing the manual copy if you're ok with the long term maintenance burden of it (I don't think its high, but some people might balk)

Honestly though the memcpy I have right now will handle any lengthening or shortening of the struct, the only risk is if they add something in the middle, but nothing should result in buffer overruns, at worst it would lead to corrupt data.