Add Pixi for development #681

Job	Run time
mypy	3m 34s
py3.13 \| macos \| unit tests	3m 55s
py3.13 \| macos \| integration tests	3m 57s
py3.13 \| ubuntu \| unit tests	3m 55s
py3.13 \| ubuntu \| integration tests	3m 54s
py3.13 \| windows \| unit tests	3m 39s
py3.13 \| windows \| integration tests	3m 40s
py3.10 \| ubuntu \| unit tests	3m 54s
py3.10 \| ubuntu \| integration tests	3m 51s
py3.11 \| ubuntu \| unit tests	3m 56s
py3.12 \| ubuntu \| unit tests	3m 57s
merge-test-artifacts	1s
	42m 13s

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