Add Pixi for development #682

Job	Run time
py3.13 \| macos \| integration tests	17m 40s
py3.13 \| macos \| unit tests	6m 54s
mypy	3m 24s
py3.13 \| ubuntu \| integration tests	15m 56s
py3.13 \| ubuntu \| unit tests	9m 32s
py3.13 \| windows \| integration tests	36m 57s
py3.13 \| windows \| unit tests	12m 33s
py3.10 \| ubuntu \| integration tests	15m 42s
py3.10 \| ubuntu \| unit tests	10m 16s
py3.11 \| ubuntu \| unit tests	9m 40s
py3.12 \| ubuntu \| unit tests	9m 38s
merge-test-artifacts	2s
	2h 28m 14s

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