Add sparse matrix interface #2018

Job	Run time
basedpyright	2m 16s
Typos	7s
Pytest Conda Py3 Intel	2m 52s
Pytest Conda Py3 POCL	3m 6s
Ruff	7s
Examples Conda Py3	1m 58s
Documentation	2m 34s
Tests for downstream project mirgecom	7s
Tests for downstream project meshmode	11m 3s
Tests for downstream project grudge	12m 0s
Tests for downstream project mirgecom_examples	6s
	36m 16s

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