On-the-fly support for Fourier Wigner transforms with Risbo recursions

[CosmoMatt]

Updates the Fourier Wigner transforms to add support for the case in which no precomputes are provided. In this case the appropriate values for the Wigner Fourier coefficients (and quadrature weights for the forward transform) are computed on-the-fly.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.33%. Comparing base (351fc94) to head (17d5d37).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #260      +/-   ##
==========================================
+ Coverage   96.29%   96.33%   +0.04%     
==========================================
  Files          31       31              
  Lines        3586     3627      +41     
==========================================
+ Hits         3453     3494      +41     
  Misses        133      133              

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[jasonmcewen]

To clarify, this uses Risbo recursion.

We discussed refactoring this so Risbo is supported for (spin) spherical harmonic transforms as well as Wigner transforms. However, it is probably better to consider that in a separate PR, so let's go ahead and merge this. I'll do a final review shortly and then we can merge.

[matt-graham]

Tests on Python 3.10+ failing due to #299 - once #300 is merged we should merge in changes from main here and rerun.