Added an 'identity' tensor splitting option #329

Job	Run time
run-tests (matrix, base, ubuntu-latest, 3.9, false)	1m 46s
run-tests (matrix, base, ubuntu-latest, 3.10, false)	2m 1s
run-tests (matrix, base, ubuntu-latest, 3.11, false)	1m 55s
run-tests (matrix, base, ubuntu-latest, 3.12, false)	2m 1s
run-tests (tensor, base, ubuntu-latest, 3.9, false)	10m 17s
run-tests (tensor, base, ubuntu-latest, 3.10, false)	8m 21s
run-tests (tensor, base, ubuntu-latest, 3.11, false)	8m 14s
run-tests (tensor, base, ubuntu-latest, 3.12, false)	9m 42s
run-tests (macos-latest, matrix, base, 3.11, true)	1m 22s
run-tests (macos-latest, tensor, base, 3.11, false)	4m 15s
run-tests (windows-latest, matrix, openblas, 3.11, false, True)	3m 36s
run-tests (windows-latest, tensor, openblas, 3.11, false, True)	13m 10s
run-tests (torch, tensor, ubuntu-latest, 3.11, false)	9m 25s
run-tests (jax, tensor, ubuntu-latest, 3.11, false)	8m 56s
run-tests (tensorflow, tensor, ubuntu-latest, 3.11, false)	10m 27s
run-tests (slepc, matrix, ubuntu-latest, 3.11, false)	2m 7s
	1h 37m 35s

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