feat: add storage root fns (#74) #230

Job	Run time
docs	14s
feature-checks	22s
clippy	20s
fmt	14s
miri --no-default-features	4m 41s
miri	32s
test stable --no-default-features	24s
miri --all-features	48s
test stable	10s
test stable --all-features	40s
test beta --no-default-features	16s
test beta	17s
test beta --all-features	43s
test nightly --no-default-features	15s
test nightly	15s
test nightly --all-features	39s
test 1.81 --no-default-features	13s
test 1.81	14s
test 1.81 --all-features	32s
	11m 49s

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