Add sparse matrix interface #1996

Job	Run time
Ruff	6s
Pytest Conda Py3 Intel	2m 33s
Typos	6s
Examples Conda Py3	1m 46s
Pytest Conda Py3 POCL	2m 59s
Tests for downstream project meshmode	10m 30s
basedpyright	2m 10s
Documentation	2m 10s
Tests for downstream project mirgecom_examples	6s
Tests for downstream project grudge	11m 45s
Tests for downstream project mirgecom	4s
	34m 15s

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