PoC: fused FFT stages (radix-2^2)

[Shnatsel]

No description provided.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 75.60976% with 100 lines in your changes missing coverage. Please review.
✅ Project coverage is 94.30%. Comparing base (3fc78e0) to head (6bc30ab).

Files with missing lines	Patch %	Lines
src/kernels/dit.rs	66.44%	100 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #103      +/-   ##
==========================================
- Coverage   99.79%   94.30%   -5.49%     
==========================================
  Files           8        8              
  Lines        1438     1808     +370     
==========================================
+ Hits         1435     1705     +270     
- Misses          3      103     +100     

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