test

Add a new quadtree nbody simulation using the Barnes Hut algorithm #1945

Job	Run time
ubuntu-latest - 3.9	6m 13s
ubuntu-latest - 3.10	6m 52s
ubuntu-latest - 3.11	8m 27s
ubuntu-latest - 3.12	8m 2s
ubuntu-latest - 3.13	8m 1s
ubuntu-24.04-arm - 3.9	5m 43s
ubuntu-24.04-arm - 3.10	5m 43s
ubuntu-24.04-arm - 3.11	6m 37s
ubuntu-24.04-arm - 3.12	8m 38s
ubuntu-24.04-arm - 3.13	8m 7s
ubuntu-latest - 3.13 free-threading	7m 50s
ubuntu-24.04-arm - 3.13 free-threading	6m 58s
ubuntu-latest - 3.14-dev	7m 8s
ubuntu-latest - 3.14-dev free-threading	8m 49s
ubuntu-latest - pypy-3.10	10m 13s
ubuntu-latest - pypy-3.9	9m 57s
macos-latest - 3.13	7m 18s
windows-latest - 3.13	11m 20s
	2h 21m 56s

Provide feedback