Use ducc0 in NIFTy.re when available
Wrap ducc0 functionality using https://gitlab.mpcdf.mpg.de/jroth/extending-jax-and-nifty and use it by default for the Hartley transformation in the CFM.
Related to #371 .
Wrap ducc0 functionality using https://gitlab.mpcdf.mpg.de/jroth/extending-jax-and-nifty and use it by default for the Hartley transformation in the CFM.
Related to #371 .