Use interleave() instead of zip_low()/zip_high() for better perf on AVX2

[Shnatsel]

This is done but can't be merged until linebender/fearless_simd#206 is published

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.17%. Comparing base (7fd74f1) to head (b53f448).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #116      +/-   ##
==========================================
- Coverage   98.18%   98.17%   -0.01%     
==========================================
  Files           9        9              
  Lines        1871     1863       -8     
==========================================
- Hits         1837     1829       -8     
  Misses         34       34              

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