fix: CUDA API bottleneck on newer CUDA versions on Linux #482
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On newer CUDA versions (Linux only), cudaGetDeviceProperties became quite a bit slower. In some downstream applications, such as instant NGP, this can lead to as much as 3x slower training (!) on high-end GPUs.
To bypass the issue, this PR caches the result of cudaGetDeviceProperties such that it only needs to be called once for each device.