[BUG] OpenMP CI compilation for MacOS on Github Actions not working

[Socrats]

Currently the parallel version of egttools for MacOS (compiled with OpenMP enabled) is not working on my setup for Github Actions. Probably we need to download the correct versions of OpenMP for Intel (x86_64) and arm64 builds to solve this. Moreover, we need to find a way to link OpenMP dynamically to egttools instead of statically and add the OpenMP dlyb to the egttools build. This is important as otherwise there are segmentation faults that can occur due to duplicated libomp errors. Particularly in an Anaconda environment.

For the moment, I have deactivated OpenMP from the MacOS builds with EGTTOOLS_EXTRA_CMAKE_ARGS="-DSKIP_OPENMP=TRUE"