Generalize blockwise slicing #285

Job	Run time
IntegrationTest (QuantumOperatorDefinitions) / QuantumOperatorDefinitions	4m 44s
IntegrationTest (GradedArrays) / GradedArrays	9m 44s
IntegrationTest (FusionTensors) / FusionTensors	7m 8s
IntegrationTest (ITensorBase) / ITensorBase	2m 52s
IntegrationTest (KroneckerArrays) / KroneckerArrays	7m 52s
IntegrationTest (NamedDimsArrays) / NamedDimsArrays	4m 24s
	36m 44s

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