[ENH] make addConfoundsToDesignMatrix a method of BidsModel

[Remi-Gau]

• closes Add load confounds options to create default model action and cli #1286

[codecov]

Codecov Report

Attention: Patch coverage is 94.20290% with 4 lines in your changes missing coverage. Please review.

Project coverage is 77.84%. Comparing base (f53979a) to head (24e20ff).
Report is 135 commits behind head on main.

Files with missing lines	Patch %	Lines
src/bids_model/BidsModel.m	94.02%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1294      +/-   ##
==========================================
- Coverage   79.57%   77.84%   -1.74%     
==========================================
  Files         285      290       +5     
  Lines        7742     7899     +157     
  Branches       40       50      +10     
==========================================
- Hits         6161     6149      -12     
- Misses       1565     1750     +185     
+ Partials       16        0      -16     

Flag	Coverage Δ
cli	0.00% <ø> (-39.00%)	⬇️
macos-13_matlab-R2023b_fast	60.49% <94.20%> (?)
macos-13_matlab-R2023b_slow	58.40% <0.00%> (?)
macos-latest_matlab-R2023a_fast	?
macos-latest_matlab-R2023a_slow	?
octave	76.43% <89.85%> (+0.71%)	⬆️
ubuntu-latest_matlab-R2023a_fast	?
ubuntu-latest_matlab-R2023a_slow	?
ubuntu-latest_matlab-R2023b_fast	60.49% <94.20%> (?)
ubuntu-latest_matlab-R2023b_slow	58.39% <0.00%> (?)
windows-latest_matlab-R2023b_fast	60.49% <94.20%> (?)
windows-latest_matlab-R2023b_slow	58.40% <0.00%> (?)

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