feat(storage): add multi-bucket feature support #3999

Job	Run time
test / test-dart-vm (3.3.0)	4m 35s
test / test-dart-vm (stable)	4m 18s
ddc_test / test-dart-ddc (3.3.0, chrome)	4m 0s
ddc_test / test-dart-ddc (3.3.0, firefox)	3m 52s
ddc_test / test-dart-ddc (stable, chrome)	3m 51s
ddc_test / test-dart-ddc (stable, firefox)	3m 45s
native_test / test-dart-native (macos-14)	4m 55s
dart2js_test / test-dart-2js (3.3.0, chrome)	4m 28s
native_test / test-dart-native (windows-latest)	5m 15s
dart2js_test / test-dart-2js (3.3.0, firefox)	4m 15s
dart2js_test / test-dart-2js (stable, chrome)	3m 56s
dart2js_test / test-dart-2js (stable, firefox)	4m 18s
	51m 28s

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