feat(storage): multi bucket download file api #3910

Job	Run time
test / test-dart-vm (3.3.0)	2m 13s
test / test-dart-vm (stable)	2m 6s
ddc_test / test-dart-ddc (3.3.0, chrome)	3m 45s
dart2js_test / test-dart-2js (3.3.0, chrome)	4m 7s
ddc_test / test-dart-ddc (3.3.0, firefox)	4m 15s
native_test / test-dart-native (macos-14)	1m 31s
dart2js_test / test-dart-2js (3.3.0, firefox)	4m 16s
ddc_test / test-dart-ddc (stable, chrome)	3m 38s
dart2js_test / test-dart-2js (stable, chrome)	3m 56s
native_test / test-dart-native (windows-latest)	4m 1s
dart2js_test / test-dart-2js (stable, firefox)	4m 3s
ddc_test / test-dart-ddc (stable, firefox)	3m 50s
	41m 41s

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