Add Action for MacOS installation

[ajaust]

This PR adds an action which installs the Python bindings on MacOS X.

[ajaust]

The action currently fails as the bindings do not find the preCICE headers. I am not sure whether I should fix it by setting the CPATH as this action currently installs preCICE in the /usr directory. We should find out, if this should be in the standard search path of MacOS X first.

[kursatyurt]

On my computer using miniconda python installation without any problem.

I just changed CFLAGS in setup.py to include -L\usr\local\include

But again I have linker problem

[BenjaminRodenberg]

Just merged develop into this PR to keep it synchronized. Seems like there are some problems. I'm not planning to work on this PR since I do not have particular interest in MacOS but would be great if any MacOS user could pick this up.

[IshaanDesai]

Keep this PR updated in the hope that we would merge the MacOS Action at some point.