feat(io): Make `Storage` a trait #5518

Job	Run time
check (macos-latest)	10m 5s
check (ubuntu-latest)	6m 37s
build_with_no_default_features (ubuntu-latest)	40s
build_with_no_default_features (macos-latest)	49s
build (macos-latest)	3m 31s
build_with_no_default_features (windows-latest)	1m 45s
Verify MSRV	3m 23s
build (windows-latest)	5m 46s
unit	12m 8s
build (ubuntu-latest)	2m 59s
	47m 43s

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