Implement CupyArrayContext #1717

Job	Run time
Examples Conda Py3	1m 36s
Mypy	1m 58s
Tests for downstream project meshmode	11m 58s
Tests for downstream project grudge	10m 17s
Documentation	1m 48s
Pytest Conda Py3 Intel	2m 3s
Tests for downstream project mirgecom	2s
Pylint	1m 54s
Tests for downstream project mirgecom_examples	3s
Pytest Conda Py3 POCL	2m 21s
Typos	4s
Ruff	4s
	34m 8s

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