Split test suite by folder #1649

Job	Run time
ubuntu (ubuntu-latest, 3.10, tests/model)	10m 50s
windows (windows-latest, 3.12, tests/model)	17m 42s
ubuntu (ubuntu-latest, 3.10, tests/statespace/test_statespace.py)	9m 15s
windows (windows-latest, 3.12, tests/statespace/test_statespace.py)	17m 45s
ubuntu (ubuntu-latest, 3.10, tests/statespace/test_kalman_filter.py)	3m 4s
windows (windows-latest, 3.12, tests/statespace/test_kalman_filter.py)	7m 29s
ubuntu (ubuntu-latest, 3.10, tests/statespace --ignore tests/statespace/test_statespace.py --igno...	8m 34s
windows (windows-latest, 3.12, tests/statespace --ignore tests/statespace/test_statespace.py --ig...	17m 10s
ubuntu (ubuntu-latest, 3.10, tests/distributions)	5m 57s
windows (windows-latest, 3.12, tests/distributions)	12m 43s
ubuntu (ubuntu-latest, 3.10, tests --ignore tests/model --ignore tests/statespace --ignore tests/...	12m 57s
windows (windows-latest, 3.12, tests --ignore tests/model --ignore tests/statespace --ignore test...	25m 28s
	2h 28m 54s

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