Draft: Add DUCC FFT support.

Antonio Sánchezrequested to merge
cantonios/eigen:ducc into master

DUCC is the successor to PocketFFT (same author), and is used by Google JAX. It is now the recommended library according to the PocketFFT author.

We're looking into using DUCC for TensorFlow and XLA as well.

Edited by Antonio Sánchez

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