API changes: `Field` and `FieldSet` #149

Job	Run time
mypy	3m 35s
py3.12 \| macos \| unit tests	9m 44s
py3.12 \| macos \| integration tests	16m 34s
py3.12 \| ubuntu \| unit tests	13m 16s
py3.12 \| ubuntu \| integration tests	18m 4s
py3.12 \| windows \| unit tests	17m 37s
py3.10 \| ubuntu \| unit tests	12m 22s
py3.12 \| windows \| integration tests	35m 46s
py3.11 \| ubuntu \| unit tests	12m 1s
merge-test-artifacts	5s
	2h 19m 4s

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