Sparse matrices #3721

Job	Run time
basedpyright	1m 59s
Conda Pytest	9m 5s
Documentation	1m 50s
Typos	5s
Ruff	7s
Tests for downstream project arraycontext	3m 7s
Conda Examples	18m 33s
Tests for downstream project meshmode	10m 37s
Tests for downstream project grudge	12m 44s
Tests for downstream project mirgecom	6s
	58m 13s

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