add better support for cFMS conda install

[rem1776]

Right now the cfms.py file is looking in a hardcoded path for the libraries installed via the autotools compile script, so it won't find use the conda cFMS package instead unless you manually edit the library path it loads like so:

        _libpath = "libcFMS.so"

This breaks the CI, but would be a good change since ctypes will search the ld_library_path including conda packages, making it a bit more flexible.

[fmalatino]

Moving toward using the scikit-build backend over setuptools will allow for a simplified installation method without the need for a compile script for cFMS and a method for placing the library at the desired location. I am currently working on a CMake installation method for cFMS to support this.