feat(storage): copy and move APIs #2385

Job	Run time
test / test-dart-vm (3.0.1)	2m 27s
test / test-dart-vm (stable)	2m 39s
native_test / test-dart-native (macos-latest)	3m 26s
ddc_test / test-dart-ddc (3.0.1, chrome)	3m 55s
dart2js_test / test-dart-2js (3.0.1, chrome)	5m 18s
native_test / test-dart-native (windows-latest)	7m 10s
ddc_test / test-dart-ddc (3.0.1, firefox)	4m 21s
dart2js_test / test-dart-2js (3.0.1, firefox)	4m 37s
ddc_test / test-dart-ddc (stable, chrome)	3m 42s
dart2js_test / test-dart-2js (stable, chrome)	4m 40s
ddc_test / test-dart-ddc (stable, firefox)	4m 3s
dart2js_test / test-dart-2js (stable, firefox)	4m 29s
	50m 47s

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