Python API work

[fedebenelli]

We are in the process of adding a Python API that wraps our library, that it is instalable with pip.

Things I consider needed to merge into dev

• [ ] Published to PyPI: Take into account this action to make wheels: https://github.com/pypa/cibuildwheel
• [x] Follow style with flake8 and black
• [ ] Sphinx generated documentation (automated with the CI so the page is a Subpage of the FORD site -or viceversa-)
• [ ] All present models accessible with their own class
• [ ] Thermoprops and phase-equilibria procedures accessible with some custom result output

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 97.80220% with 2 lines in your changes missing coverage. Please review.

Project coverage is 92.04%. Comparing base (9613363) to head (e642bb0).

Files	Patch %	Lines
src/models/residual_helmholtz/ar_models.f90	97.77%	0 Missing and 1 partial :warning:
src/phase_equilibria/stability.f90	66.66%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## dev #86 +/- ## ========================================== - Coverage 92.05% 92.04% -0.01% ========================================== Files 54 54 Lines 2543 2540 -3 Branches 190 190 ========================================== - Hits 2341 2338 -3 Misses 154 154 Partials 48 48 ```

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[fedebenelli]

Algo a tener en cuenta es que la API C tiene que luego quedar dentro de la librería misma y no en la subcarpeta de Python. En la subcarpeta de Python debería de haber un solo archivo yaeos_python.f90 tipo:

! yaeos_python.f90
module yaeos_python
    use yaeos_c_interface
end module

Yo me encargo de esto, pero lo dejo asentado acá para no olvidarme