Exposing `cuLibraryGetModule` in `cuda.core`

[isVoid]

For legacy library, it takes time to migrate from module dependent APIs to library dependent APIs. In the transition time, cuLibraryGetModule is a very useful API to allow switching from context independent module loading to old style module management, providing backward compatibility. Since cuda.core operates with context independent module loading, ti would be helpful to expose this API in cuda.core to support better integration with legacy libraries.

[leofang]

The implementation of this will depend on #490.