Implement nondeterministic finite transducers (NFTs) #594

Job	Run time
run-test-performance (macos-latest)	8m 53s
run-test-performance-base (macos-latest)	7m 0s
run-tests (ubuntu-latest)	4m 59s
warnings-base (ubuntu-latest)	5m 6s
run-tests (macos-latest)	2m 18s
warnings-new (ubuntu-latest)	2m 52s
warnings-base (macos-latest)	4m 14s
warnings-new (macos-latest)	3m 53s
code-coverage	2m 23s
compare-versions (ubuntu-latest)	3s
compare-versions (macos-latest)	6s
compare-performance (macos-latest)	39s
	42m 26s

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