feat: add storage root fns #229

Job	Run time
docs	14s
clippy	21s
feature-checks	23s
fmt	10s
miri --no-default-features	4m 55s
test stable --no-default-features	15s
miri	38s
test stable	11s
miri --all-features	47s
test stable --all-features	37s
test beta --no-default-features	16s
test beta	17s
test beta --all-features	43s
test nightly --no-default-features	21s
test nightly	15s
test nightly --all-features	44s
test 1.81 --no-default-features	13s
test 1.81	15s
test 1.81 --all-features	28s
	12m 3s

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