feat(storage): copy and move APIs #1667

Job	Run time
test / test-dart-vm (3.0.1)	2m 5s
test / test-dart-vm (stable)	2m 8s
native_test / test-dart-native (macos-latest)	3m 10s
dart2js_test / test-dart-2js (3.0.1, chrome)	4m 20s
ddc_test / test-dart-ddc (3.0.1, chrome)	3m 37s
native_test / test-dart-native (windows-latest)	5m 23s
dart2js_test / test-dart-2js (3.0.1, firefox)	4m 24s
ddc_test / test-dart-ddc (3.0.1, firefox)	3m 54s
dart2js_test / test-dart-2js (stable, chrome)	4m 51s
ddc_test / test-dart-ddc (stable, chrome)	4m 7s
dart2js_test / test-dart-2js (stable, firefox)	4m 43s
ddc_test / test-dart-ddc (stable, firefox)	3m 46s
	46m 28s

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