feat: re-export `rayon` feature (#827) #2212

Job	Run time
features stable	2m 45s
test ubuntu-latest stable --no-default-features	1m 28s
features stable --all-targets	3m 53s
check no_std	43s
features nightly	1m 36s
clippy	48s
test ubuntu-latest stable	1m 19s
features nightly --all-targets	2m 56s
test ubuntu-latest nightly --no-default-features	54s
test ubuntu-latest nightly	59s
fmt	20s
test ubuntu-latest 1.81 --no-default-features	40s
docs	35s
miri --no-default-features	4m 55s
test ubuntu-latest 1.81	38s
miri	4m 56s
test windows-latest stable --no-default-features	4m 25s
wasm	41s
miri --all-features	7m 20s
test windows-latest stable	3m 20s
test windows-latest nightly --no-default-features	2m 0s
test windows-latest nightly	2m 5s
test windows-latest 1.81 --no-default-features	1m 46s
test windows-latest 1.81	1m 32s
test ubuntu-latest 1.81 --features json	40s
test windows-latest 1.81 --features json	1m 55s
test ubuntu-latest nightly --all-features	1m 15s
test windows-latest nightly --all-features	2m 27s
deny / cargo deny check	19s
ci success	2s
	59m 12s

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