Implement CupyArrayContext #1823

Job	Run time
Mypy	1m 51s
Tests for downstream project meshmode	11m 42s
basedpyright	1m 51s
Documentation	1m 36s
Tests for downstream project grudge	9m 40s
Examples Conda Py3	1m 17s
Tests for downstream project mirgecom	4s
Pytest Conda Py3 Intel	1m 54s
Tests for downstream project mirgecom_examples	3s
Ruff	6s
Typos	6s
Pytest Conda Py3 POCL	2m 23s
	32m 33s

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