Add sparse matrix interface #2016

Job	Run time
Ruff	10s
basedpyright	2m 10s
Examples Conda Py3	1m 56s
Pytest Conda Py3 POCL	3m 19s
Pytest Conda Py3 Intel	2m 55s
Typos	7s
Documentation	2m 32s
Tests for downstream project meshmode	3m 21s
Tests for downstream project grudge	3m 16s
Tests for downstream project mirgecom	6s
Tests for downstream project mirgecom_examples	6s
	19m 58s

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