Align `DecodedOutput` with `BatchDecodedOutput` #1260

Job	Run time
generate-matrix / generate	6s
Build and Upload Mac wheel / wheel-py3_9-cpu	1m 56s
Build and Upload Mac wheel / upload / wheel-py3_9-cpu	13s
install-and-test (3.9, 4.4.2)	1m 58s
install-and-test (3.9, 5.1.2)	1m 58s
install-and-test (3.9, 6.1.1)	2m 3s
install-and-test (3.9, 7.0.1)	2m 2s
	10m 16s

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