Align `DecodedOutput` with `BatchDecodedOutput` #1259

Job	Run time
generate-matrix / generate	4s
Build and Upload Linux wheel / manywheel-py3_9-cpu	4m 27s
Build and Upload Linux wheel / upload / manywheel-py3_9-cpu	15s
install-and-test (3.9, 4.4.2)	1m 46s
install-and-test (3.9, 5.1.2)	1m 45s
install-and-test (3.9, 6.1.1)	1m 51s
install-and-test (3.9, 7.0.1)	1m 40s
	11m 48s

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