Make basic INLA interface and simple marginalisation routine #2085

Job	Run time
windows (windows-latest, 3.12, tests/distributions)	2m 50s
windows (windows-latest, 3.12, tests/statespace/core/test_statespace.py)	5m 12s
windows (windows-latest, 3.12, tests/statespace --ignore tests/statespace/core/test_statespace.py...	2m 54s
ubuntu (ubuntu-latest, 3.11, tests/model)	1m 2s
windows (windows-latest, 3.12, tests/model)	2m 49s
windows (windows-latest, 3.12, tests --ignore tests/model --ignore tests/statespace --ignore test...	3m 5s
ubuntu (ubuntu-latest, 3.11, tests/statespace/core/test_statespace.py)	56s
ubuntu (ubuntu-latest, 3.11, tests/distributions)	54s
ubuntu (ubuntu-latest, 3.11, tests/statespace/filters/test_kalman_filter.py)	2m 13s
windows (windows-latest, 3.12, tests/statespace/filters/test_kalman_filter.py)	7m 0s
ubuntu (ubuntu-latest, 3.11, tests/statespace --ignore tests/statespace/core/test_statespace.py -...	1m 8s
ubuntu (ubuntu-latest, 3.11, tests --ignore tests/model --ignore tests/statespace --ignore tests/...	1m 8s
all_tests	3s
	31m 14s

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