DiagonalStudentT distribution #179

Job	Run time
lint	1m 12s
test (ubuntu-latest, 3.10, jax)	5m 21s
test (ubuntu-latest, 3.10, tensorflow)	5m 40s
test (ubuntu-latest, 3.10, torch)	3m 39s
test (ubuntu-latest, 3.11, jax)	6m 20s
test (ubuntu-latest, 3.11, tensorflow)	5m 45s
test (ubuntu-latest, 3.11, torch)	3m 56s
test (windows-latest, 3.10, jax)	10m 8s
test (windows-latest, 3.10, tensorflow)	10m 47s
test (windows-latest, 3.10, torch)	9m 20s
test (windows-latest, 3.11, jax)	11m 31s
test (windows-latest, 3.11, tensorflow)	11m 15s
test (windows-latest, 3.11, torch)	11m 11s
	1h 36m 5s

Provide feedback