Add precompiled library for standalone C API to github release page

[mtreinish]

Right now on release we only publish Python release artifacts to PyPI, the new C API in standalone mode we rely on end users to build from source or rely on some other packaging mechanism to get the shared library. We should look at hosting precompiled binaries for our supported platforms on the github release assets on a given release. We'll have to make some statements around system library expectations for use of the precompiled binaries but this would at least give users an option for using standalone C without needing to build from source.