Add sparse matrix interface #1991

Job	Run time
Ruff	8s
Typos	5s
Pytest Conda Py3 POCL	3m 13s
Documentation	2m 24s
Pytest Conda Py3 Intel	2m 35s
basedpyright	2m 14s
Tests for downstream project grudge	11m 55s
Examples Conda Py3	1m 49s
Tests for downstream project mirgecom_examples	7s
Tests for downstream project meshmode	10m 54s
Tests for downstream project mirgecom	5s
	35m 29s

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