Mirror np.fft

[hippalectryon-0]

We mirror scipy.fft, but not anymore numpy.fft.

scipy.fft is mostly an overload of numpy.fft so this should be trivial.

• [ ] Mirror np.fft
• [ ] Add utests

[hippalectryon-0]

Related: https://github.com/dask/dask/issues/6440

Maybe it's better to only keep scipy.fft

[hippalectryon-0]

Closing until we have users that actually require this