Improved CMake Target Exporting and Downstream Quantum-Classical add_executable()

[amccaskey]

We need to create an exported target for qcor. More importantly though, we need to create helper functions to handle the inclusion of qsharp and qasm3 files into a compiled target.

[amccaskey]

Update:

We would like to see the development of a true CMake qcor::qcor target for downstream users to import. This would enable downstream projects to develop upon the qcor runtime infrastructure through a find_package(QCOR) call.

Moreover, the exported cmake script should also publish helper functions for creating C++ codes with quantum kernels, i.e., an add_executable or function like that for library building that will leverage the qcor compiler executable.