Add support for logical indexing that preserves block sparsity #193

Job	Run time
IntegrationTest (NamedDimsArrays) / NamedDimsArrays	3m 41s
IntegrationTest (ITensorBase) / ITensorBase	2m 50s
IntegrationTest (GradedArrays) / GradedArrays	3m 34s
IntegrationTest (FusionTensors) / FusionTensors	1m 19s
IntegrationTest (QuantumOperatorDefinitions) / QuantumOperatorDefinitions	3m 43s
	15m 7s

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