API changes: `Field` and `FieldSet` #139

Job	Run time
mypy	3m 43s
py3.12 \| macos \| integration tests	6m 12s
py3.12 \| macos \| unit tests	6m 12s
py3.12 \| ubuntu \| integration tests	6m 10s
py3.12 \| ubuntu \| unit tests	6m 11s
py3.12 \| windows \| integration tests	6m 0s
py3.12 \| windows \| unit tests	5m 56s
py3.10 \| ubuntu \| unit tests	6m 9s
py3.11 \| ubuntu \| unit tests	6m 9s
merge-test-artifacts	1s
	52m 43s

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