Support cuMemcpy2D with stride (pitch)

[andreytkachenko]

Now to create an image aligned to CubeDim I need create intermediate unaligned buffer and copy image from unaligned to aligned dest image or create extra aligned allocation on host and do aligned copy the image. It can be avoided (without extra allocations) both in wgpu (aligned memcpy to mapped buffer) and cuda (using cuMemcpy2D).