Remove dataclass from BaseFakeNumpyNamespace #1913

Job	Run time
Pytest Conda Py3 POCL	2m 27s
Pytest Conda Py3 Intel	2m 22s
Typos	7s
Ruff	6s
Examples Conda Py3	1m 30s
basedpyright	1m 49s
Documentation	1m 47s
Tests for downstream project meshmode	11m 23s
Tests for downstream project grudge	10m 47s
Tests for downstream project mirgecom_examples	5s
Tests for downstream project mirgecom	4s
	32m 27s

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