Tests

DiagonalStudentT distribution #201

Job	Run time
lint	1m 8s
test (ubuntu-latest, 3.10, jax)	5m 35s
test (ubuntu-latest, 3.10, tensorflow)	5m 23s
test (ubuntu-latest, 3.10, torch)	3m 44s
test (ubuntu-latest, 3.11, jax)	6m 50s
test (ubuntu-latest, 3.11, tensorflow)	5m 31s
test (ubuntu-latest, 3.11, torch)	4m 6s
test (windows-latest, 3.10, jax)	9m 16s
test (windows-latest, 3.10, tensorflow)	11m 17s
test (windows-latest, 3.10, torch)	10m 46s
test (windows-latest, 3.11, jax)	11m 22s
test (windows-latest, 3.11, tensorflow)	10m 58s
test (windows-latest, 3.11, torch)	10m 59s
	1h 36m 55s

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