Add sparse matrix interface #2002

Job	Run time
Pytest Conda Py3 Intel	2m 43s
Documentation	2m 22s
Typos	4s
basedpyright	2m 9s
Ruff	9s
Tests for downstream project meshmode	10m 42s
Tests for downstream project grudge	11m 47s
Pytest Conda Py3 POCL	2m 58s
Tests for downstream project mirgecom_examples	7s
Tests for downstream project mirgecom	4s
Examples Conda Py3	1m 48s
	34m 53s

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