Make SparseArrays an extension package #1249

Job	Run time
setup_matrix	1m 45s
break (PartiallySeparableNLPModels, latest)	10m 55s
break (PartiallySeparableNLPModels, stable)	7m 57s
break (Percival, latest)	6m 42s
break (Percival, stable)	6m 46s
break (CaNNOLeS, latest)	6m 30s
break (CaNNOLeS, stable)	6m 9s
break (PartitionedVectors, latest)	1m 8s
break (PartitionedVectors, stable)	1m 15s
break (DCISolver, latest)	6m 6s
break (DCISolver, stable)	5m 56s
break (JSOSolvers, latest)	11m 16s
break (JSOSolvers, stable)	11m 13s
break (PartiallySeparableSolvers, latest)	3m 44s
break (PartiallySeparableSolvers, stable)	3m 43s
break (RipQP, latest)	13m 29s
break (RipQP, stable)	15m 19s
break (AdaptiveRegularization, latest)	14m 31s
break (AdaptiveRegularization, stable)	13m 51s
break (FletcherPenaltySolver, latest)	26m 38s
break (FletcherPenaltySolver, stable)	27m 6s
upload	9s
	3h 22m 8s

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