concentrate FFT providers in one function.

[anarkiwi]

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[codecov]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (bf408e2) 76.32% compared to head (ed51325) 76.33%.
Report is 3 commits behind head on main.

Files	Patch %	Lines
gamutrf/grscan.py	92.30%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1040      +/-   ##
==========================================
+ Coverage   76.32%   76.33%   +0.01%     
==========================================
  Files          43       43              
  Lines        3636     3638       +2     
==========================================
+ Hits         2775     2777       +2     
  Misses        861      861              

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