Add pickling support for arrays, buffers #1643

Job	Run time
Examples	2m 12s
Tests for downstream project loopy	3m 46s
Pylint	1m 36s
Tests for downstream project boxtree	9m 11s
Pytest Linux POCL	3m 6s
Tests for downstream project meshmode	9m 24s
Pytest Linux Intel CL	1m 53s
Pytest Mac POCL	1m 54s
Pytest Windows Intel CL	4m 3s
Ruff	8s
Documentation	1m 12s
Mypy	1m 2s
	39m 27s

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