science/qt6-quick3dphysics: New port

Qt Quick 3D Physics provides a high-level API for physics simulation. It
supports simulating interactive rigid bodies as well as static meshes and
non-colliding bodies used for detecting overlaps. Every simulated body
can have its own physical properties like mass, density and friction.

https://doc.qt.io/qt-6/qtquick3dphysics-index.html