feat(storage): allow the s3 list api to accept an optional bucket #2043

Job	Run time
test / test-dart-vm (3.3.0)	1m 41s
test / test-dart-vm (stable)	1m 25s
dart2js_test / test-dart-2js (3.3.0, chrome)	5m 58s
dart2js_test / test-dart-2js (3.3.0, firefox)	5m 46s
ddc_test / test-dart-ddc (3.3.0, chrome)	4m 20s
ddc_test / test-dart-ddc (3.3.0, firefox)	4m 27s
native_test / test-dart-native (macos-14)	3m 55s
native_test / test-dart-native (windows-latest)	5m 32s
dart2js_test / test-dart-2js (stable, chrome)	5m 55s
ddc_test / test-dart-ddc (stable, chrome)	4m 25s
ddc_test / test-dart-ddc (stable, firefox)	4m 17s
dart2js_test / test-dart-2js (stable, firefox)	5m 40s
	53m 21s

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