Remove timestamps keyword from Field and FieldSet #696

Job	Run time
mypy	3m 55s
py3.13 \| macos \| integration tests	11m 33s
py3.13 \| macos \| unit tests	12m 43s
py3.13 \| ubuntu \| integration tests	14m 1s
py3.13 \| ubuntu \| unit tests	9m 51s
py3.13 \| windows \| integration tests	22m 54s
py3.13 \| windows \| unit tests	13m 54s
py3.10 \| ubuntu \| integration tests	14m 28s
py3.10 \| ubuntu \| unit tests	10m 47s
py3.11 \| ubuntu \| unit tests	9m 57s
py3.12 \| ubuntu \| unit tests	10m 47s
merge-test-artifacts	0s
	2h 14m 50s

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