Support subclass fields in dataclass_array_container #1918

Job	Run time
Typos	4s
Pytest Conda Py3 POCL	2m 29s
basedpyright	1m 49s
Ruff	8s
Documentation	1m 42s
Pytest Conda Py3 Intel	2m 5s
Tests for downstream project meshmode	11m 28s
Tests for downstream project mirgecom_examples	4s
Examples Conda Py3	1m 23s
Tests for downstream project grudge	9m 57s
Tests for downstream project mirgecom	4s
	31m 13s

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