Build updates
A few bugfixes for the release builds.
- Removing the in-place rust extension was broken on previous releases, resulting in an extra library being included in the linux builds.
- MacOS has a "universal2" option which setuptools_rust supports.
- Our use of the strip option for the setuptools_rust RustExtension was incorrect (maybe it took a boolean in an old version?). I've updated it to properly strip debug symbols, which should further reduce the size of the linux wheels.