test

Add a new quadtree nbody simulation using the Barnes Hut algorithm #1946

Job	Run time
ubuntu-latest - 3.9	6m 17s
ubuntu-latest - 3.10	6m 27s
ubuntu-latest - 3.11	7m 39s
ubuntu-latest - 3.12	7m 51s
ubuntu-latest - 3.13	8m 8s
ubuntu-24.04-arm - 3.9	5m 58s
ubuntu-24.04-arm - 3.10	5m 55s
ubuntu-24.04-arm - 3.11	6m 35s
ubuntu-24.04-arm - 3.12	6m 51s
ubuntu-24.04-arm - 3.13	6m 55s
ubuntu-latest - 3.13 free-threading	7m 59s
ubuntu-24.04-arm - 3.13 free-threading	7m 0s
ubuntu-latest - 3.14-dev	6m 53s
ubuntu-latest - 3.14-dev free-threading	7m 42s
ubuntu-latest - pypy-3.10	10m 14s
ubuntu-latest - pypy-3.9	9m 55s
macos-latest - 3.13	5m 38s
windows-latest - 3.13	11m 8s
	2h 15m 5s

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