Move Field tests to separate file #441

Job	Run time
mypy	3m 54s
py3.13 \| macos \| integration tests	17m 21s
py3.13 \| macos \| unit tests	9m 44s
py3.13 \| ubuntu \| integration tests	13m 34s
py3.13 \| ubuntu \| unit tests	13m 6s
py3.13 \| windows \| integration tests	19m 15s
py3.13 \| windows \| unit tests	21m 7s
py3.10 \| ubuntu \| integration tests	11m 30s
py3.10 \| ubuntu \| unit tests	12m 50s
py3.11 \| ubuntu \| unit tests	2m 32s
py3.12 \| ubuntu \| unit tests	2m 40s
merge-test-artifacts	0s
	2h 7m 33s

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