Add sparse matrix interface #1988

Job	Run time
Examples Conda Py3	1m 54s
Typos	4s
basedpyright	2m 12s
Documentation	2m 26s
Pytest Conda Py3 POCL	3m 5s
Ruff	7s
Pytest Conda Py3 Intel	2m 57s
Tests for downstream project meshmode	10m 34s
Tests for downstream project mirgecom_examples	6s
Tests for downstream project grudge	11m 36s
Tests for downstream project mirgecom	6s
	35m 7s

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