Request to add Fortran module directory to exported target include path

[aaroncblack]

I think Caliper is missing the Fortran module directory in its exported target's include paths. (or I'm overlooking it, can let me know)

The code structure looks similar to Umpire, so may be something that can be quickly adapted from:
https://github.com/LLNL/Umpire/blob/develop/src/umpire/interface/c_fortran/CMakeLists.txt