Make basic INLA interface and simple marginalisation routine #2113

Job	Run time
ubuntu (ubuntu-latest, 3.11, tests/statespace/filters/test_kalman_filter.py)	3m 0s
ubuntu (ubuntu-latest, 3.11, tests/statespace/core/test_statespace.py)	9m 48s
ubuntu (ubuntu-latest, 3.11, tests/model)	9m 43s
windows (windows-latest, 3.12, tests/statespace/filters/test_kalman_filter.py)	5m 43s
windows (windows-latest, 3.12, tests/statespace --ignore tests/statespace/core/test_statespace.py...	15m 38s
windows (windows-latest, 3.12, tests --ignore tests/model --ignore tests/statespace --ignore test...	25m 49s
windows (windows-latest, 3.12, tests/statespace/core/test_statespace.py)	13m 39s
ubuntu (ubuntu-latest, 3.11, tests/distributions)	7m 0s
ubuntu (ubuntu-latest, 3.11, tests/statespace --ignore tests/statespace/core/test_statespace.py -...	10m 31s
windows (windows-latest, 3.12, tests/distributions)	12m 22s
ubuntu (ubuntu-latest, 3.11, tests --ignore tests/model --ignore tests/statespace --ignore tests/...	12m 10s
windows (windows-latest, 3.12, tests/model)	15m 23s
all_tests	2s
	2h 20m 48s

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