Support getattr for prior module #1838

Job	Run time
ubuntu (ubuntu-latest, 3.11, tests/statespace/core/test_statespace.py)	8m 5s
ubuntu (ubuntu-latest, 3.11, tests/statespace --ignore tests/statespace/core/test_statespace.py -...	7m 0s
ubuntu (ubuntu-latest, 3.11, tests/model)	8m 42s
windows (windows-latest, 3.12, tests/statespace --ignore tests/statespace/core/test_statespace.py...	11m 34s
windows (windows-latest, 3.12, tests/statespace/core/test_statespace.py)	12m 45s
ubuntu (ubuntu-latest, 3.11, tests/statespace/filters/test_kalman_filter.py)	2m 30s
windows (windows-latest, 3.12, tests/statespace/filters/test_kalman_filter.py)	5m 52s
ubuntu (ubuntu-latest, 3.11, tests/distributions)	6m 10s
windows (windows-latest, 3.12, tests --ignore tests/model --ignore tests/statespace --ignore test...	23m 1s
windows (windows-latest, 3.12, tests/distributions)	11m 28s
ubuntu (ubuntu-latest, 3.11, tests --ignore tests/model --ignore tests/statespace --ignore tests/...	14m 1s
windows (windows-latest, 3.12, tests/model)	16m 46s
all_tests	2s
	2h 7m 56s

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