Python 3.13 support (native libraries)

[eric-upchurch]

First, thank you for all your work on this library!

We are in the process of moving to Python 3.13, and while the library itself is compatible, there are no native distributions compiled against Python 3.13, so the propagator falls back to pure-python mode, which is significantly slower.

Is it possible to compile and release native wheel files for Python 3.13?