API changes: `particleset.py` and `grid.py` #144

Job	Run time
mypy	3m 42s
py3.12 \| macos \| integration tests	17m 10s
py3.12 \| macos \| unit tests	8m 3s
py3.12 \| ubuntu \| integration tests	18m 52s
py3.12 \| ubuntu \| unit tests	13m 1s
py3.12 \| windows \| unit tests	20m 27s
py3.12 \| windows \| integration tests	30m 54s
py3.10 \| ubuntu \| unit tests	11m 53s
py3.11 \| ubuntu \| unit tests	12m 3s
merge-test-artifacts	3s
	2h 16m 8s

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