Make CUDAFuture handle any kind of device type (#57051)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/57051
Make CUDAFuture autodetect the devicetype from its arguments (which thus change from DeviceIndices to full Devices). This in fact transforms CUDAFuture into a AnythingFuture, since it's not tied to CUDA in any way anymore. Having made it fully device-agnostic, we'll merge it into ivalue::Future in the next PR.
ghstack-source-id: 127713134
(Note: this ignores all push blocking failures!)
Test Plan: CI
Reviewed By: mrshenli
Differential Revision: D28032711
fbshipit-source-id: 8ba23b1b0d97f61db8693cd5f3c7bae7989a9bcd
