ENH: transition to SciPy sparse arrays from matrices #1515

Job	Run time
notebooks	1s
examples	1s
array_api_tests (Numba)	7s
array_api_tests (Finch)	1s
Test ubuntu-latest (test-numba test-finch test-mlir test-numba-mindeps test-finch-mindeps test-mlir-mindeps)	1s
Test windows-latest (test-numba test-finch test-mlir)	1s
Test macos-latest (test-numba test-finch test-mlir)	5s
	17s

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