Dummy project for demonstrating how and testing whether consuming the LUE repository works.
When configuring the project, CMake will first try to find LUE using FindPackage. If that fails,
FetchContent is used to download and configure LUE (and HPX) as part of the lue_consume
project. Whichever option is used to obtain the LUE targets is not relevant to how to use the
LUE targets in the CMake and C++ code.