Unify convolutions

[ASEM000]

Remove input dilation, rename kernel dilation to dilation

Simplified internals for FFT variants.

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.19% 🎉

Comparison is base (4055028) 93.86% compared to head (12f43e0) 94.05%.

❗ Current head 12f43e0 differs from pull request most recent head 9d4c86b. Consider uploading reports for the commit 9d4c86b to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #24      +/-   ##
==========================================
+ Coverage   93.86%   94.05%   +0.19%     
==========================================
  Files          40       40              
  Lines        3423     3332      -91     
==========================================
- Hits         3213     3134      -79     
+ Misses        210      198      -12     

Files Changed	Coverage Δ
serket/nn/convolution.py	94.04% <ø> (-0.02%)	⬇️
serket/nn/dropout.py	92.78% <ø> (ø)
serket/nn/recurrent.py	83.83% <ø> (ø)
tests/test_fft_convolution.py	100.00% <ø> (ø)
serket/nn/utils.py	82.70% <100.00%> (+4.28%)	⬆️
tests/test_convolution.py	100.00% <100.00%> (ø)

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