Support subclass fields in dataclass_array_container #1919

Job	Run time
Examples Conda Py3	1m 21s
Documentation	1m 51s
Pytest Conda Py3 Intel	2m 3s
Ruff	7s
Tests for downstream project grudge	10m 7s
Tests for downstream project meshmode	11m 27s
Typos	5s
basedpyright	1m 56s
Tests for downstream project mirgecom	6s
Pytest Conda Py3 POCL	2m 24s
Tests for downstream project mirgecom_examples	6s
	31m 33s

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