feat(io): Make `Storage` a trait #5512

Job	Run time
check (ubuntu-latest)	6m 50s
check (macos-latest)	7m 15s
build (macos-latest)	3m 24s
unit	9m 44s
build (windows-latest)	7m 44s
build_with_no_default_features (windows-latest)	1m 43s
build_with_no_default_features (macos-latest)	1m 0s
build (ubuntu-latest)	3m 40s
build_with_no_default_features (ubuntu-latest)	32s
Verify MSRV	3m 22s
	45m 14s

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