Make basic INLA interface and simple marginalisation routine #2083

Job	Run time
windows (windows-latest, 3.12, tests/model)	3m 23s
windows (windows-latest, 3.12, tests/distributions)	2m 45s
ubuntu (ubuntu-latest, 3.11, tests/model)	58s
windows (windows-latest, 3.12, tests/statespace --ignore tests/statespace/core/test_statespace.py...	2m 51s
windows (windows-latest, 3.12, tests/statespace/filters/test_kalman_filter.py)	4m 39s
windows (windows-latest, 3.12, tests/statespace/core/test_statespace.py)	3m 2s
windows (windows-latest, 3.12, tests --ignore tests/model --ignore tests/statespace --ignore test...	4m 4s
ubuntu (ubuntu-latest, 3.11, tests/statespace/core/test_statespace.py)	56s
ubuntu (ubuntu-latest, 3.11, tests/distributions)	56s
ubuntu (ubuntu-latest, 3.11, tests/statespace/filters/test_kalman_filter.py)	2m 9s
ubuntu (ubuntu-latest, 3.11, tests/statespace --ignore tests/statespace/core/test_statespace.py -...	1m 0s
ubuntu (ubuntu-latest, 3.11, tests --ignore tests/model --ignore tests/statespace --ignore tests/...	1m 2s
all_tests	4s
	27m 49s

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