Implement CupyArrayContext #1800

Job	Run time
Mypy	2m 1s
Documentation	1m 50s
Tests for downstream project meshmode	11m 22s
Examples Conda Py3	1m 33s
Pylint	1m 54s
Tests for downstream project grudge	10m 14s
Pytest Conda Py3 Intel	2m 7s
Tests for downstream project mirgecom	3s
Pytest Conda Py3 POCL	2m 36s
Tests for downstream project mirgecom_examples	1s
Ruff	7s
Typos	4s
	33m 52s

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