feat: expand Seal api #2090

Job	Run time
docs	29s
check no_std	1m 46s
clippy	55s
features stable	2m 21s
features stable --all-targets	3m 37s
fmt	13s
miri --no-default-features	4m 50s
features nightly	1m 42s
miri	4m 42s
features nightly --all-targets	2m 53s
test ubuntu-latest stable --no-default-features	1m 14s
wasm	33s
miri --all-features	7m 7s
test ubuntu-latest stable	1m 17s
test ubuntu-latest nightly --no-default-features	47s
test ubuntu-latest nightly	52s
test ubuntu-latest 1.79 --no-default-features	42s
test ubuntu-latest 1.79	39s
test windows-latest stable --no-default-features	3m 11s
test windows-latest stable	2m 52s
test windows-latest nightly --no-default-features	2m 31s
test windows-latest nightly	2m 33s
test windows-latest 1.79 --no-default-features	1m 37s
test windows-latest 1.79	1m 32s
test ubuntu-latest 1.79 --features json	42s
test windows-latest 1.79 --features json	1m 36s
test ubuntu-latest nightly --all-features	1m 11s
test windows-latest nightly --all-features	2m 43s
	57m 7s

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