Add SpFFT: sparse 3D FFT library (#13458)
Add SpFFT: sparse 3D FFT library (#13458)

* Add SpFFT: sparse 3D FFT library

SpFFT is required as a dependency for SIRIUS

* cleanup

* add missing dependency

LLNL/spack,iulian787/spack,iulian787/spack,LLNL/spack,iulian787/spack,iulian787/spack,iulian787/spack,LLNL/spack,LLNL/spack,LLNL/spack