Parcels v4 FieldSet design documentation #532

Job	Run time
py3.13 \| macos \| unit tests	10m 27s
py3.13 \| macos \| integration tests	16m 11s
mypy	4m 14s
py3.13 \| ubuntu \| unit tests	13m 58s
py3.13 \| ubuntu \| integration tests	17m 36s
py3.13 \| windows \| unit tests	20m 31s
py3.13 \| windows \| integration tests	45m 26s
py3.10 \| ubuntu \| unit tests	14m 31s
py3.10 \| ubuntu \| integration tests	17m 52s
py3.11 \| ubuntu \| unit tests	13m 45s
py3.12 \| ubuntu \| unit tests	14m 44s
merge-test-artifacts	0s
	3h 9m 15s

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