Add sparse matrix interface #1986

Job	Run time
Examples Conda Py3	2m 9s
Typos	5s
Pytest Conda Py3 POCL	3m 24s
Ruff	7s
Pytest Conda Py3 Intel	2m 48s
basedpyright	2m 8s
Tests for downstream project meshmode	11m 9s
Tests for downstream project grudge	10m 18s
Tests for downstream project mirgecom	4s
Documentation	2m 18s
Tests for downstream project mirgecom_examples	5s
	34m 35s

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