Add CLI argument in BidsValidator plugin

[pvandyken]

Adds a --skip-bids-validation argument to the CLI automatically, eliminating the need to add the argument manually. The argument is overridable with the dest plugins.validator.skip, so this change is backward compatible.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.32%. Comparing base (76a8fbf) to head (0736d99).
Report is 18 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #443      +/-   ##
==========================================
+ Coverage   94.30%   94.32%   +0.01%     
==========================================
  Files          55       55              
  Lines        2196     2203       +7     
==========================================
+ Hits         2071     2078       +7     
  Misses        125      125              

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