rfc: Making Storage a Trait #6099

Job	Run time
Verify MSRV	3m 9s
check (macos-latest)	7m 24s
build_with_no_default_features (macos-latest)	38s
Unit Tests (default)	5m 26s
check (ubuntu-latest)	6m 10s
build_with_no_default_features (windows-latest)	1m 27s
build_with_no_default_features (ubuntu-latest)	33s
build (windows-latest)	7m 9s
build (macos-latest)	2m 55s
build (ubuntu-latest)	3m 2s
Unit Tests (doc)	2m 24s
	40m 17s

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