test

Add a new quadtree nbody simulation using the Barnes Hut algorithm #1944

Job	Run time
ubuntu-latest - 3.9	7m 8s
ubuntu-latest - 3.10	6m 34s
ubuntu-latest - 3.11	7m 46s
ubuntu-latest - 3.12	7m 55s
ubuntu-latest - 3.13	8m 8s
ubuntu-24.04-arm - 3.9	5m 32s
ubuntu-24.04-arm - 3.10	6m 43s
ubuntu-24.04-arm - 3.11	6m 42s
ubuntu-24.04-arm - 3.12	6m 51s
ubuntu-24.04-arm - 3.13	6m 47s
ubuntu-latest - 3.13 free-threading	7m 50s
ubuntu-24.04-arm - 3.13 free-threading	7m 7s
ubuntu-latest - 3.14-dev	7m 5s
ubuntu-latest - 3.14-dev free-threading	8m 44s
ubuntu-latest - pypy-3.10	10m 43s
ubuntu-latest - pypy-3.9	10m 18s
macos-latest - 3.13	5m 52s
windows-latest - 3.13	11m 45s
	2h 19m 30s

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