[ENH] improve error messages for invalid input data

[Remi-Gau]

fixes #130
fixes #137

[codecov]

Codecov Report

Attention: Patch coverage is 60.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 85.24%. Comparing base (1bcca23) to head (aeccfb0).
Report is 102 commits behind head on main.

Files with missing lines	Patch %	Lines
bidsmreye/bids_utils.py	0.00%	1 Missing ⚠️
bidsmreye/configuration.py	75.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #150      +/-   ##
==========================================
+ Coverage   79.91%   85.24%   +5.33%     
==========================================
  Files          13       13              
  Lines         926      888      -38     
  Branches      119        0     -119     
==========================================
+ Hits          740      757      +17     
+ Misses        144      131      -13     
+ Partials       42        0      -42     

Flag	Coverage Δ
tests	85.24% <60.00%> (+5.44%)	⬆️

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