add PEPS.zeros #347

Job	Run time
run-tests (matrix, base, ubuntu-latest, 3.9, false)	2m 12s
run-tests (matrix, base, ubuntu-latest, 3.12, false)	2m 26s
run-tests (tensor, base, ubuntu-latest, 3.9, false)	9m 29s
run-tests (tensor, base, ubuntu-latest, 3.12, false)	10m 39s
run-tests (macos-latest, matrix, base, 3.11, true)	2m 27s
run-tests (macos-latest, tensor, base, 3.11, false)	11m 6s
run-tests (windows-latest, matrix, openblas, 3.11, false, True)	5m 19s
run-tests (windows-latest, tensor, openblas, 3.11, false, True)	10m 57s
run-tests (torch, tensor, ubuntu-latest, 3.11, false)	10m 51s
run-tests (jax, tensor, ubuntu-latest, 3.11, false)	10m 24s
run-tests (tensorflow, tensor, ubuntu-latest, 3.11, false)	10m 47s
run-tests (slepc, matrix, ubuntu-latest, 3.11, false)	10m 51s
	1h 37m 28s

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