API changes: `particleset.py` and `grid.py` #152

Job	Run time
py3.12 \| macos \| integration tests	15m 31s
py3.12 \| macos \| unit tests	8m 5s
mypy	3m 29s
py3.12 \| ubuntu \| integration tests	18m 54s
py3.12 \| ubuntu \| unit tests	13m 4s
py3.12 \| windows \| integration tests	32m 31s
py3.12 \| windows \| unit tests	22m 3s
py3.10 \| ubuntu \| unit tests	11m 56s
py3.11 \| ubuntu \| unit tests	12m 16s
merge-test-artifacts	5s
	2h 17m 54s

Provide feedback