Make basic INLA interface and simple marginalisation routine #2106

Job	Run time
windows (windows-latest, 3.12, tests/statespace/core/test_statespace.py)	14m 3s
windows (windows-latest, 3.12, tests/model)	14m 55s
windows (windows-latest, 3.12, tests --ignore tests/model --ignore tests/statespace --ignore test...	25m 7s
windows (windows-latest, 3.12, tests/statespace/filters/test_kalman_filter.py)	5m 40s
windows (windows-latest, 3.12, tests/distributions)	12m 47s
windows (windows-latest, 3.12, tests/statespace --ignore tests/statespace/core/test_statespace.py...	15m 32s
ubuntu (ubuntu-latest, 3.11, tests/statespace --ignore tests/statespace/core/test_statespace.py -...	10m 26s
ubuntu (ubuntu-latest, 3.11, tests/statespace/core/test_statespace.py)	9m 47s
ubuntu (ubuntu-latest, 3.11, tests --ignore tests/model --ignore tests/statespace --ignore tests/...	11m 52s
ubuntu (ubuntu-latest, 3.11, tests/statespace/filters/test_kalman_filter.py)	3m 3s
ubuntu (ubuntu-latest, 3.11, tests/model)	10m 5s
ubuntu (ubuntu-latest, 3.11, tests/distributions)	7m 10s
all_tests	2s
	2h 20m 29s

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