[feat] Manage files for the package for unit tests and examples

[Cervangirard]

Issues to validate to close :

• [ ] issue #56

Checklist:

• [x] Does the package check works locally?
• [x] Does the CI pass?
• [x] Are the added / fixed features documented, tested?
• [x] Are the changes related to tickets / issues that I have listed in the commits and in the PR itself?
• [x] Are the tickets in "review" mode in the Project Tracking Board?
• [ ] Does each ticket, if it is to be closed after acceptance of the PR, contain a comment that tells how to validate it?

[codecov[bot]]

Codecov Report

Merging #58 (ba33b3a) into main (aaad3c6) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #58   +/-   ##
=======================================
  Coverage   64.43%   64.43%           
=======================================
  Files           4        4           
  Lines         537      537           
=======================================
  Hits          346      346           
  Misses        191      191           

Impacted Files	Coverage Δ
R/fm_build_data_params_map.R	53.26% <ø> (ø)
R/fm_fit_model.R	87.15% <ø> (ø)

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