Revert "chore: replace Signature with PrimitiveSignature" #2144

Job	Run time
miri --no-default-features	4m 41s
test ubuntu-latest stable --no-default-features	1m 20s
clippy	41s
check no_std	53s
miri	4m 36s
test ubuntu-latest stable	1m 19s
test ubuntu-latest nightly --no-default-features	47s
miri --all-features	7m 26s
docs	29s
test ubuntu-latest nightly	49s
features stable	2m 15s
test ubuntu-latest 1.79 --no-default-features	41s
fmt	13s
wasm	36s
test ubuntu-latest 1.79	36s
features stable --all-targets	3m 28s
test windows-latest stable --no-default-features	3m 34s
features nightly	1m 38s
test windows-latest stable	3m 14s
features nightly --all-targets	2m 50s
test windows-latest nightly --no-default-features	2m 7s
test windows-latest nightly	2m 11s
test windows-latest 1.79 --no-default-features	1m 30s
test windows-latest 1.79	1m 56s
test ubuntu-latest 1.79 --features json	37s
test windows-latest 1.79 --features json	1m 38s
test ubuntu-latest nightly --all-features	1m 14s
test windows-latest nightly --all-features	2m 51s
ci success	4s
	56m 14s

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