Make basic INLA interface and simple marginalisation routine #2134

Job	Run time
windows (windows-latest, 3.12, tests/model)	3m 16s
windows (windows-latest, 3.12, tests/statespace/filters/test_kalman_filter.py)	3m 29s
windows (windows-latest, 3.12, tests/statespace/core/test_statespace.py)	3m 0s
windows (windows-latest, 3.12, tests/distributions)	3m 3s
windows (windows-latest, 3.12, tests/statespace --ignore tests/statespace/core/test_statespace.py...	2m 55s
ubuntu (ubuntu-latest, 3.11, tests/statespace --ignore tests/statespace/core/test_statespace.py -...	56s
ubuntu (ubuntu-latest, 3.11, tests/statespace/core/test_statespace.py)	1m 0s
ubuntu (ubuntu-latest, 3.11, tests/statespace/filters/test_kalman_filter.py)	2m 3s
windows (windows-latest, 3.12, tests --ignore tests/model --ignore tests/statespace --ignore test...	3m 0s
ubuntu (ubuntu-latest, 3.11, tests/distributions)	59s
ubuntu (ubuntu-latest, 3.11, tests/model)	1m 6s
ubuntu (ubuntu-latest, 3.11, tests --ignore tests/model --ignore tests/statespace --ignore tests/...	1m 16s
all_tests	4s
	26m 7s

Provide feedback