feat: add transmute for views

[dkales]

This adds the transmute and transmute_mut methods to CudaView and CudaViewMut types, also adds them to the tests for basic functionality checks.

[dkales]

This has the same doc issues as #281, but it is fixed over there

[dkales]

One design decision is if transmutes should consume the view types via self instead. I don't think anything inherently bad can happen in the current design.

[coreylowman]

I think using references is fine since the returned values are hooked to the lifetime of the original view and therefore of the original data.

[coreylowman]

Thanks for the contribution!