feat(storage): copy and move APIs #2205

Job	Run time
test / test-dart-vm (3.0.1)	4m 36s
test / test-dart-vm (stable)	4m 27s
dart2js_test / test-dart-2js (3.0.1, chrome)	7m 28s
ddc_test / test-dart-ddc (3.0.1, chrome)	5m 53s
dart2js_test / test-dart-2js (3.0.1, firefox)	7m 43s
native_test / test-dart-native (macos-latest)	6m 25s
ddc_test / test-dart-ddc (3.0.1, firefox)	6m 16s
dart2js_test / test-dart-2js (stable, chrome)	6m 57s
native_test / test-dart-native (windows-latest)	7m 2s
ddc_test / test-dart-ddc (stable, chrome)	5m 57s
dart2js_test / test-dart-2js (stable, firefox)	7m 1s
ddc_test / test-dart-ddc (stable, firefox)	5m 40s
	1h 15m 25s

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