Add sparse matrix interface #2019

Job	Run time
Typos	6s
Examples Conda Py3	2m 3s
basedpyright	2m 14s
Pytest Conda Py3 POCL	3m 11s
Pytest Conda Py3 Intel	2m 51s
Tests for downstream project mirgecom	6s
Tests for downstream project grudge	12m 15s
Documentation	2m 27s
Tests for downstream project mirgecom_examples	5s
Ruff	10s
Tests for downstream project meshmode	10m 56s
	36m 24s

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