Make basic INLA interface and simple marginalisation routine #2108

Job	Run time
ubuntu (ubuntu-latest, 3.11, tests/model)	6m 5s
ubuntu (ubuntu-latest, 3.11, tests/statespace --ignore tests/statespace/core/test_statespace.py -...	6m 7s
ubuntu (ubuntu-latest, 3.11, tests/statespace/core/test_statespace.py)	6m 6s
windows (windows-latest, 3.12, tests/statespace/core/test_statespace.py)	5m 58s
ubuntu (ubuntu-latest, 3.11, tests --ignore tests/model --ignore tests/statespace --ignore tests/...	6m 6s
windows (windows-latest, 3.12, tests/distributions)	6m 2s
windows (windows-latest, 3.12, tests --ignore tests/model --ignore tests/statespace --ignore test...	5m 58s
windows (windows-latest, 3.12, tests/model)	5m 57s
ubuntu (ubuntu-latest, 3.11, tests/distributions)	6m 4s
ubuntu (ubuntu-latest, 3.11, tests/statespace/filters/test_kalman_filter.py)	3m 10s
windows (windows-latest, 3.12, tests/statespace --ignore tests/statespace/core/test_statespace.py...	5m 57s
windows (windows-latest, 3.12, tests/statespace/filters/test_kalman_filter.py)	5m 32s
all_tests	4s
	1h 9m 6s

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