Parcels v4 FieldSet design documentation #542

Job	Run time
py3.13 \| macos \| integration tests	12m 51s
py3.13 \| macos \| unit tests	8m 42s
mypy	3m 25s
py3.13 \| ubuntu \| integration tests	18m 47s
py3.13 \| ubuntu \| unit tests	13m 43s
py3.13 \| windows \| integration tests	28m 48s
py3.13 \| windows \| unit tests	20m 15s
py3.10 \| ubuntu \| integration tests	18m 47s
py3.10 \| ubuntu \| unit tests	13m 44s
py3.11 \| ubuntu \| unit tests	13m 43s
py3.12 \| ubuntu \| unit tests	14m 54s
merge-test-artifacts	4s
	2h 47m 43s

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