Always return dictionary from data_info #2200

Job	Run time
windows (windows-latest, 3.12, tests/model)	14m 49s
ubuntu (ubuntu-latest, 3.11, tests/model)	9m 49s
windows (windows-latest, 3.12, tests --ignore tests/model --ignore tests/statespace --ignore test...	21m 43s
windows (windows-latest, 3.12, tests/distributions)	9m 27s
windows (windows-latest, 3.12, tests/statespace/core/test_statespace.py)	12m 13s
windows (windows-latest, 3.12, tests/statespace --ignore tests/statespace/core/test_statespace.py...	17m 43s
ubuntu (ubuntu-latest, 3.11, tests/statespace/core/test_statespace.py)	10m 16s
ubuntu (ubuntu-latest, 3.11, tests/statespace/filters/test_kalman_filter.py)	3m 5s
ubuntu (ubuntu-latest, 3.11, tests --ignore tests/model --ignore tests/statespace --ignore tests/...	13m 13s
ubuntu (ubuntu-latest, 3.11, tests/statespace --ignore tests/statespace/core/test_statespace.py -...	13m 15s
ubuntu (ubuntu-latest, 3.11, tests/distributions)	7m 14s
windows (windows-latest, 3.12, tests/statespace/filters/test_kalman_filter.py)	18m 49s
all_tests	3s
	2h 31m 39s

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