Add sparse matrix interface #2000

Job	Run time
Tests for downstream project mirgecom_examples	4s
Pytest Conda Py3 POCL	2m 56s
basedpyright	2m 21s
Documentation	2m 15s
Examples Conda Py3	1m 44s
Tests for downstream project mirgecom	5s
Ruff	6s
Pytest Conda Py3 Intel	2m 31s
Tests for downstream project grudge	12m 14s
Tests for downstream project meshmode	10m 49s
Typos	5s
	35m 10s

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