Add support for block sparse QR decomposition #152

Job	Run time
IntegrationTest (GradedArrays) / GradedArrays	3m 4s
IntegrationTest (FusionTensors) / FusionTensors	1m 13s
IntegrationTest (NamedDimsArrays) / NamedDimsArrays	1m 11s
IntegrationTest (ITensorBase) / ITensorBase	1m 14s
IntegrationTest (QuantumOperatorDefinitions) / QuantumOperatorDefinitions	1m 5s
	7m 47s

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