Add pickling support for arrays, buffers #1632

Job	Run time
Pylint	1m 30s
Pytest Linux POCL	3m 3s
Mypy	1m 2s
Ruff	5s
Documentation	1m 13s
Tests for downstream project loopy	4m 8s
Examples	2m 11s
Tests for downstream project boxtree	8m 58s
Tests for downstream project meshmode	9m 30s
Pytest Linux Intel CL	1m 53s
Pytest Mac POCL	1m 54s
Pytest Windows Intel CL	3m 31s
	38m 58s

Provide feedback