APIs for external libraries

[fedebenelli]

This pull request focuses on the wrapping of external libraries, at the end of the pull requests it should include

• Wrappers to known libraries:

  • FeOs

    • Object saving pointer
    • json string generator
    • Model calling interface

  • teqp

    • Object saving pointer
    • json string generator
    • Model calling interface

• Maybe some C API standard type?

• Move the C-API of yaeos-python to be called from other C libraries

[codecov]

Codecov Report

Attention: Patch coverage is 42.69663% with 51 lines in your changes missing coverage. Please review.

Project coverage is 91.97%. Comparing base (e8aa28b) to head (5765ab1).

Files	Patch %	Lines
src/fitting/fit_nrtl_mhv.f90	0.00%	38 Missing ⚠️
src/models/external_apis/feos.f90	75.75%	8 Missing ⚠️
src/fitting/fitting.f90	58.33%	4 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev      #87      +/-   ##
==========================================
- Coverage   93.60%   91.97%   -1.63%     
==========================================
  Files          53       56       +3     
  Lines        2392     2468      +76     
  Branches      179      179              
==========================================
+ Hits         2239     2270      +31     
- Misses        105      150      +45     
  Partials       48       48              

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