This improves how the installed CutterConfig.cmake can be used for
native plugin development:
* Transitive dependencies are resolved automatically
* Version file is included
* Cutter_USER_PLUGINDIR is set to a path that plugins can use as a
default install destination
src/plugins/sample-cpp/CMakeLists.txt is an example for how to use it.
Rizin was also updated to prevent an error with multiple
`find_package()` calls.
API usage has been adjusted.
There are now also cmake config files directly installed by Rizin itself, so we don't need to keep a custom FindRizin.cmake file in Cutter. This remove that file and just uses `find_package(Rizin COMPONENTS Core)`, which will use the cmake files installed on the system.
