allow model and key overrides in the profile

[Henrrypg]

This PR makes it possible to have configurations such as the model or api_key in the profile (not recomended, but it makes onboarding very easy).

During the refactor, the name of "config" in the LLMProcessor was changed to "provider" to better reflect the use that is getting. Also "config" is a very loaded word already.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.38%. Comparing base (c4a03d7) to head (0b1611a).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #79      +/-   ##
==========================================
+ Coverage   90.09%   90.38%   +0.29%     
==========================================
  Files          46       46              
  Lines        4129     4182      +53     
  Branches      266      267       +1     
==========================================
+ Hits         3720     3780      +60     
+ Misses        320      314       -6     
+ Partials       89       88       -1     

Flag	Coverage Δ
unittests	90.38% <ø> (+0.29%)	⬆️

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[felipemontoya]

Thanks @henrry. I took your code and refactored a bit more.