Add sparse matrix interface #1985

Job	Run time
Pytest Conda Py3 Intel	4m 24s
Pytest Conda Py3 POCL	4m 36s
basedpyright	3m 46s
Typos	4s
Documentation	3m 41s
Examples Conda Py3	3m 27s
Ruff	6s
Tests for downstream project meshmode	12m 18s
Tests for downstream project mirgecom_examples	7s
Tests for downstream project grudge	13m 14s
Tests for downstream project mirgecom	8s
	45m 51s

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