Revert "feat: Scalar type for finite fields" #21

Job	Run time
docs	17s
feature-checks	18s
clippy	17s
Code Coverage	50s
fmt	14s
test stable --no-default-features	15s
test stable	19s
test stable --all-features	13s
test beta --no-default-features	16s
test beta	24s
test beta --all-features	18s
test nightly --no-default-features	14s
test nightly	17s
test nightly --all-features	18s
test 1.65 --no-default-features	13s
test 1.65	14s
	4m 57s

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