Add sparse matrix interface #2013

Job	Run time
basedpyright	2m 27s
Pytest Conda Py3 Intel	2m 46s
Typos	5s
Ruff	8s
Tests for downstream project meshmode	6h 5m 0s
Documentation	3m 28s
Pytest Conda Py3 POCL	3m 0s
Tests for downstream project mirgecom	8s
Tests for downstream project mirgecom_examples	7s
Tests for downstream project grudge	12m 29s
Examples Conda Py3	2m 3s
	6h 31m 41s

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