perf(primitives): improve checksum algorithm #1937

Job	Run time
clippy	1m 1s
docs	51s
feature-checks	5m 40s
fmt	14s
test ubuntu-latest stable --no-default-features	1m 8s
wasm	40s
test ubuntu-latest stable	1m 11s
test ubuntu-latest beta --no-default-features	1m 35s
test ubuntu-latest beta	1m 30s
test ubuntu-latest nightly --no-default-features	1m 17s
test ubuntu-latest nightly	1m 12s
test ubuntu-latest 1.65 --no-default-features	54s
test ubuntu-latest 1.65	56s
test windows-latest stable --no-default-features	2m 43s
test windows-latest stable	2m 42s
test windows-latest beta --no-default-features	2m 55s
test windows-latest beta	2m 51s
test windows-latest nightly --no-default-features	2m 42s
test windows-latest nightly	2m 38s
test windows-latest 1.65 --no-default-features	1m 38s
test windows-latest 1.65	1m 41s
test ubuntu-latest 1.65 --features json	56s
test windows-latest 1.65 --features json	1m 53s
test ubuntu-latest stable --all-features	1m 30s
test ubuntu-latest beta --all-features	1m 43s
test ubuntu-latest nightly --all-features	1m 22s
miri --no-default-features	4m 28s
miri	4m 24s
miri --all-features	5m 17s
	59m 32s

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