test

Add a new quadtree nbody simulation using the Barnes Hut algorithm (#… #1961

Job	Run time
ubuntu-latest - 3.9	6m 16s
ubuntu-latest - 3.10	6m 29s
ubuntu-latest - 3.11	7m 45s
ubuntu-latest - 3.12	8m 0s
ubuntu-latest - 3.13	7m 47s
ubuntu-24.04-arm - 3.9	5m 32s
ubuntu-24.04-arm - 3.10	5m 33s
ubuntu-24.04-arm - 3.11	6m 39s
ubuntu-24.04-arm - 3.12	7m 1s
ubuntu-24.04-arm - 3.13	6m 58s
ubuntu-latest - 3.13 free-threading	7m 50s
ubuntu-24.04-arm - 3.13 free-threading	7m 0s
ubuntu-latest - 3.14-dev	6m 55s
ubuntu-latest - 3.14-dev free-threading	8m 6s
ubuntu-latest - pypy-3.10	10m 24s
ubuntu-latest - pypy-3.9	9m 52s
macos-latest - 3.13	7m 24s
windows-latest - 3.13	12m 0s
	2h 17m 31s

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