Support for Fields in multiple files without a `time` dimension #513

Job	Run time
mypy	3m 48s
py3.13 \| macos \| unit tests	4m 20s
py3.13 \| macos \| integration tests	13m 48s
py3.13 \| ubuntu \| unit tests	5m 27s
py3.13 \| ubuntu \| integration tests	17m 37s
py3.13 \| windows \| unit tests	11m 31s
py3.13 \| windows \| integration tests	30m 19s
py3.10 \| ubuntu \| unit tests	5m 21s
py3.10 \| ubuntu \| integration tests	17m 33s
py3.11 \| ubuntu \| unit tests	5m 47s
py3.12 \| ubuntu \| unit tests	5m 33s
merge-test-artifacts	0s
	2h 1m 4s

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