feat(storage): copy and move APIs #2677

Job	Run time
test / test-dart-vm (3.0.1)	4m 39s
test / test-dart-vm (stable)	4m 7s
ddc_test / test-dart-ddc (3.0.1, chrome)	10m 12s
ddc_test / test-dart-ddc (3.0.1, firefox)	11m 3s
ddc_test / test-dart-ddc (stable, chrome)	9m 51s
ddc_test / test-dart-ddc (stable, firefox)	11m 50s
dart2js_test / test-dart-2js (3.0.1, chrome)	15m 0s
dart2js_test / test-dart-2js (3.0.1, firefox)	14m 7s
dart2js_test / test-dart-2js (stable, chrome)	13m 23s
dart2js_test / test-dart-2js (stable, firefox)	14m 5s
native_test / test-dart-native (macos-latest)	9m 41s
native_test / test-dart-native (windows-latest)	6m 19s
	2h 4m 17s

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