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cuFFT based FFT ops #1396

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@mayocream

Currently, cubek has 1D FFT ops, but the performance is not as good as native cuFFT calls. Is it possible to support cuFFT-based FFT when using CUDA? The safe cuFFT APIs are already being added in cudarc.

Opened this issue in CubeCL since the changes are required to be made inside CubeCL to allow cuFFT calls to be used at a higher level.

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