API changes: `particleset.py` and `grid.py` #159

Job	Run time
py3.12 \| macos \| unit tests	13m 39s
mypy	2m 36s
py3.12 \| macos \| integration tests	17m 48s
py3.12 \| ubuntu \| unit tests	12m 5s
py3.12 \| ubuntu \| integration tests	18m 51s
py3.12 \| windows \| unit tests	19m 20s
py3.12 \| windows \| integration tests	20m 21s
py3.10 \| ubuntu \| unit tests	11m 38s
py3.11 \| ubuntu \| unit tests	11m 34s
merge-test-artifacts	1s
	2h 7m 53s

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