Tests

Added an 'identity' tensor splitting option #297

Job	Run time
run-tests (matrix, base, ubuntu-latest, 3.9, false)	2m 12s
run-tests (matrix, base, ubuntu-latest, 3.10, false)	2m 19s
run-tests (matrix, base, ubuntu-latest, 3.11, false)	2m 18s
run-tests (matrix, base, ubuntu-latest, 3.12, false)	2m 30s
run-tests (tensor, base, ubuntu-latest, 3.9, false)	2m 55s
run-tests (tensor, base, ubuntu-latest, 3.10, false)	3m 2s
run-tests (tensor, base, ubuntu-latest, 3.11, false)	2m 55s
run-tests (tensor, base, ubuntu-latest, 3.12, false)	2m 55s
run-tests (macos-latest, matrix, base, 3.11, true)	2m 16s
run-tests (macos-latest, tensor, base, 3.11, false)	2m 58s
run-tests (windows-latest, matrix, openblas, 3.11, false, True)	2m 42s
run-tests (windows-latest, tensor, openblas, 3.11, false, True)	2m 41s
run-tests (torch, tensor, ubuntu-latest, 3.11, false)	2m 56s
run-tests (jax, tensor, ubuntu-latest, 3.11, false)	3m 2s
run-tests (tensorflow, tensor, ubuntu-latest, 3.11, false)	2m 55s
run-tests (slepc, matrix, ubuntu-latest, 3.11, false)	2m 38s
	43m 14s

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