Move Field tests to separate file #444

Job	Run time
mypy	3m 58s
py3.13 \| macos \| unit tests	10m 41s
py3.13 \| macos \| integration tests	23m 12s
py3.13 \| ubuntu \| unit tests	12m 55s
py3.13 \| ubuntu \| integration tests	18m 18s
py3.13 \| windows \| unit tests	20m 0s
py3.13 \| windows \| integration tests	28m 0s
py3.10 \| ubuntu \| unit tests	12m 50s
py3.10 \| ubuntu \| integration tests	18m 17s
py3.11 \| ubuntu \| unit tests	12m 48s
py3.12 \| ubuntu \| unit tests	14m 12s
merge-test-artifacts	4s
	2h 55m 15s

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