Remove ESMA_cmake, use f2py-cmake from scikit-build

[mathomp4]

This PR attempts to move GMAOpyobs away from ESMA_cmake and its F2Py handling and instead use the f2py-cmake code from scikit-build.

This seems to work for me both here and in QFED (see GEOS-ESM/QFED#18), but all I've done is try building.

NOTE 1: As I have no idea how to use any of this code, this is just a "it builds" change. It's possible nothing actually runs correctly.

NOTE 2: Due to an issue found with f2py-cmake when used multiple times, the UseF2Py.cmake file in this PR is not exactly that you get from the mother repo.

[mathomp4]

Note to @amdasilva: I could also remove mepo entirely from here and QFED. We could move to use git submodules if it's preferred. If you only have one or two "subrepos", submodules are just as useful and more "generic".