Make basic INLA interface and simple marginalisation routine #2152

Job	Run time
ubuntu (ubuntu-latest, 3.11, tests/statespace/core/test_statespace.py)	59s
ubuntu (ubuntu-latest, 3.11, tests/statespace/filters/test_kalman_filter.py)	2m 12s
ubuntu (ubuntu-latest, 3.11, tests/statespace --ignore tests/statespace/core/test_statespace.py -...	57s
ubuntu (ubuntu-latest, 3.11, tests/model)	59s
ubuntu (ubuntu-latest, 3.11, tests --ignore tests/model --ignore tests/statespace --ignore tests/...	1m 7s
windows (windows-latest, 3.12, tests/model)	3m 17s
windows (windows-latest, 3.12, tests --ignore tests/model --ignore tests/statespace --ignore test...	3m 9s
windows (windows-latest, 3.12, tests/statespace/core/test_statespace.py)	3m 58s
windows (windows-latest, 3.12, tests/statespace/filters/test_kalman_filter.py)	4m 24s
ubuntu (ubuntu-latest, 3.11, tests/distributions)	1m 0s
windows (windows-latest, 3.12, tests/statespace --ignore tests/statespace/core/test_statespace.py...	2m 59s
windows (windows-latest, 3.12, tests/distributions)	2m 54s
all_tests	4s
	27m 59s

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