Add sparse matrix interface #2017

Job	Run time
Typos	7s
Ruff	9s
Pytest Conda Py3 POCL	3m 6s
Pytest Conda Py3 Intel	2m 47s
basedpyright	2m 6s
Tests for downstream project mirgecom_examples	5s
Examples Conda Py3	2m 5s
Documentation	2m 37s
Tests for downstream project mirgecom	4s
Tests for downstream project meshmode	11m 18s
Tests for downstream project grudge	12m 9s
	36m 33s

Provide feedback