Revert "chore: replace Signature with PrimitiveSignature" (#800) #2146

Job	Run time
miri --no-default-features	4m 36s
test ubuntu-latest stable --no-default-features	1m 24s
test ubuntu-latest stable	1m 18s
miri	4m 43s
test ubuntu-latest nightly --no-default-features	47s
miri --all-features	7m 11s
check no_std	58s
test ubuntu-latest nightly	53s
test ubuntu-latest 1.79 --no-default-features	36s
clippy	44s
test ubuntu-latest 1.79	41s
docs	36s
test windows-latest stable --no-default-features	3m 7s
test windows-latest stable	3m 46s
features stable	2m 14s
wasm	47s
test windows-latest nightly --no-default-features	2m 2s
features stable --all-targets	3m 22s
test windows-latest nightly	2m 1s
features nightly	1m 34s
test windows-latest 1.79 --no-default-features	1m 35s
features nightly --all-targets	2m 50s
test windows-latest 1.79	1m 27s
test ubuntu-latest 1.79 --features json	38s
test windows-latest 1.79 --features json	1m 39s
fmt	14s
test ubuntu-latest nightly --all-features	1m 5s
test windows-latest nightly --all-features	2m 40s
ci success	3s
	55m 31s

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