build

Refactor storage types #153

Job	Run time
fmt	51s
build (stable, --features "")	48s
codecov	2m 28s
clippy	49s
build (stable, --all-features)	2m 10s
build (stable, --no-default-features)	38s
build (1.71, --features "")	41s
test	2m 35s
build (1.71, --all-features)	1m 55s
build (1.71, --no-default-features)	37s
build (beta, --features "")	36s
build (beta, --all-features)	1m 53s
build (beta, --no-default-features)	28s
build (nightly, --features "")	44s
build (nightly, --all-features)	3m 0s
build (nightly, --no-default-features)	27s
	20m 40s

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