Add config option to disable date validation in GS1 messages

[jodal]

Fixes #247

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (46bb26f) to head (78117c7).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #386   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           16        16           
  Lines         1076      1080    +4     
  Branches       110       111    +1     
=========================================
+ Hits          1076      1080    +4     

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