Support for Fields in multiple files without a `time` dimension #514

Job	Run time
mypy	3m 59s
py3.13 \| macos \| integration tests	18m 3s
py3.13 \| macos \| unit tests	10m 30s
py3.13 \| ubuntu \| integration tests	19m 30s
py3.13 \| ubuntu \| unit tests	14m 12s
py3.13 \| windows \| integration tests	27m 56s
py3.13 \| windows \| unit tests	18m 49s
py3.10 \| ubuntu \| integration tests	18m 2s
py3.10 \| ubuntu \| unit tests	13m 36s
py3.11 \| ubuntu \| unit tests	13m 38s
py3.12 \| ubuntu \| unit tests	14m 22s
merge-test-artifacts	3s
	2h 52m 40s

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