feat: re-export `rayon` feature #2208

Job	Run time
check no_std	1m 33s
clippy	1m 7s
docs	57s
features stable	2m 12s
features stable --all-targets	3m 33s
fmt	11s
miri --no-default-features	5m 21s
features nightly	2m 21s
miri	5m 18s
test ubuntu-latest stable --no-default-features	1m 19s
wasm	34s
features nightly --all-targets	3m 40s
miri --all-features	7m 42s
test ubuntu-latest stable	1m 18s
test ubuntu-latest nightly --no-default-features	1m 15s
test ubuntu-latest nightly	1m 22s
test ubuntu-latest 1.81 --no-default-features	37s
test ubuntu-latest 1.81	38s
test windows-latest stable --no-default-features	3m 11s
test windows-latest stable	3m 8s
test windows-latest nightly --no-default-features	2m 30s
test windows-latest nightly	2m 32s
test windows-latest 1.81 --no-default-features	1m 24s
test windows-latest 1.81	1m 48s
test ubuntu-latest 1.81 --features json	42s
test windows-latest 1.81 --features json	1m 32s
test ubuntu-latest nightly --all-features	1m 24s
test windows-latest nightly --all-features	2m 58s
deny / cargo deny check	17s
ci success	4s
	1h 2m 28s

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