Pysheds Cupy / Cuspatial support

[dan771]

One way for huge optimizations would be to support natively Cupy or Cuspatial. I tried replacing the numpy import on the sys level with cupy however a few small inconsistencies arise. Although cupy requires Nvidia and cuda I feel the headline 10 times performance boost on most numpy operations feels highly worth it for the amount of work you'd need to facilitate native support.

[mdbartos]

Thanks @dan771. I am interested in supporting GPU processing, especially for the highly parallelizable functions like flow directions. Numba also supports GPU processing, and so I may leverage numba for this purpose in the future.