feat: re-export `rayon` feature #2211

Job	Run time
docs	42s
clippy	52s
check no_std	49s
features stable	2m 37s
fmt	14s
features stable --all-targets	3m 27s
features nightly	1m 38s
miri --no-default-features	4m 55s
features nightly --all-targets	2m 44s
miri	5m 2s
test ubuntu-latest stable --no-default-features	1m 15s
miri --all-features	7m 54s
wasm	36s
test ubuntu-latest stable	1m 17s
test ubuntu-latest nightly --no-default-features	56s
test ubuntu-latest nightly	1m 0s
test ubuntu-latest 1.81 --no-default-features	40s
test ubuntu-latest 1.81	37s
test windows-latest stable --no-default-features	2m 34s
test windows-latest stable	3m 13s
test windows-latest nightly --no-default-features	2m 12s
test windows-latest nightly	2m 9s
test windows-latest 1.81 --no-default-features	3m 12s
test windows-latest 1.81	1m 29s
test ubuntu-latest 1.81 --features json	37s
test windows-latest 1.81 --features json	1m 46s
test ubuntu-latest nightly --all-features	1m 11s
test windows-latest nightly --all-features	2m 50s
deny / cargo deny check	15s
ci success	1s
	58m 44s

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