Make Component compliant with BMI

[ThibHlln]

The Basic Model Interface (BMI) is a set of functions that standardizes how numerical models can be queried, modified, and run. A model with a BMI exposes the same set of functions, no matter which language the model is written in. While a BMI can be specified for any language, CSDMS currently supports C, C++, Fortran, and Python. https://csdms.colorado.edu/wiki/Workbench

More information available here: https://bmi.readthedocs.io/en/latest/

Making the framework's Component BMI-compliant would have several benefits:

• Fortran/C/C++ components can be turned into a Python package using babelizer (https://babelizer.readthedocs.io/en/latest/), this would allow us to lift our dependency on numpy.f2py which is not maintained anymore, and harmonise the way Fortran source code on one side and C/C++ source code on the other side are packaged (at the moment the former with f2py, and the latter with cython)
• component contributions made to cm4twc can be reused in other BMI-compliant frameworks, this would make the contributions even more worth the effort

Making a Component BMI-compliant would not increase the effort involved in making a component contribution as the set of functions making up the BMI will be given to the contributors "for free" (i.e. by class inheritance), they will only need to implement the initialise-run-finalise methods, as before.

There may be some issues with juggling between CSDMS standard names and CF-conventions standard names.