Add support for block sparse QR decomposition #156

Job	Run time
IntegrationTest (FusionTensors) / FusionTensors	1m 17s
IntegrationTest (GradedArrays) / GradedArrays	8m 32s
IntegrationTest (QuantumOperatorDefinitions) / QuantumOperatorDefinitions	4m 38s
IntegrationTest (ITensorBase) / ITensorBase	2m 56s
IntegrationTest (NamedDimsArrays) / NamedDimsArrays	4m 8s
	21m 31s

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