feat: add Sealed::as_sealed_ref (#859) #2292

Job	Run time
wasm	22s
miri --no-default-features	5m 31s
test ubuntu-latest stable --no-default-features	1m 0s
miri	5m 25s
check no_std	37s
clippy	45s
miri --all-features	8m 25s
test ubuntu-latest stable	59s
test ubuntu-latest nightly --no-default-features	48s
docs	37s
test ubuntu-latest nightly	48s
fmt	14s
features stable	1m 38s
test ubuntu-latest 1.81 --no-default-features	40s
features stable --all-targets	2m 43s
test ubuntu-latest 1.81	35s
features nightly	1m 43s
test windows-latest stable --no-default-features	2m 43s
features nightly --all-targets	3m 1s
test windows-latest stable	3m 3s
test windows-latest nightly --no-default-features	1m 57s
test windows-latest nightly	1m 53s
test windows-latest 1.81 --no-default-features	1m 17s
test windows-latest 1.81	1m 42s
test ubuntu-latest 1.81 --features json	40s
test windows-latest 1.81 --features json	1m 36s
test ubuntu-latest nightly --all-features	1m 11s
test windows-latest nightly --all-features	2m 43s
deny / cargo deny check	15s
ci success	2s
	54m 53s

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