feat(primitives): add some more utility methods to PrimitiveSignature #2367

Job	Run time
clippy	54s
check no_std	41s
docs	49s
features stable	49s
features stable --all-targets	49s
fmt	13s
miri --no-default-features	49s
features nightly	53s
miri	47s
features nightly --all-targets	52s
wasm	30s
miri --all-features	49s
test ubuntu-latest stable --no-default-features	45s
test ubuntu-latest stable	47s
test ubuntu-latest nightly --no-default-features	52s
test ubuntu-latest nightly	53s
test ubuntu-latest 1.81 --no-default-features	35s
test ubuntu-latest 1.81	39s
test windows-latest stable --no-default-features	35s
test windows-latest stable	33s
test windows-latest nightly --no-default-features	53s
test windows-latest nightly	1m 15s
test windows-latest 1.81 --no-default-features	33s
test windows-latest 1.81	33s
test ubuntu-latest 1.81 --features json	39s
test windows-latest 1.81 --features json	32s
test ubuntu-latest nightly --all-features	55s
test windows-latest nightly --all-features	53s
deny / cargo deny check	17s
ci success	2s
	21m 6s

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