chore: add a FFT trait to deduplicate FFT code #393

Job	Run time
Build - x86_64-apple-darwin	1m 16s
Build - aarch64-apple-darwin	1m 11s
Build - x86_64-unknown-linux-gnu	1m 9s
Build - aarch64-unknown-linux-gnu	1m 21s
Build - x86_64-pc-windows-msvc	14m 55s
Build - aarch64-pc-windows-msvc	14m 59s
Test - x86_64-apple-darwin - node@20	41s
Test - aarch64-apple-darwin - node@20	38s
Test - x86_64-unknown-linux-gnu - node@20	26s
Test - aarch64-unknown-linux-gnu - node@20	38s
Test - x86_64-pc-windows-msvc - node@20	37s
Test - aarch64-pc-windows-msvc - node@20	38s
Publish	0s
	38m 29s

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