Verifactu Code Prefix and Suffix

[apardods]

Describe your changes

Added the text fields required for the QR code.

Checklist before requesting a review

• I have performed a self-review of my code.
• I have added thorough tests with at least 90% code coverage.
• I've modified or created example GOBL documents the show my changes in use, if appropriate.
• When adding or modifying a tax regime or addon, I've added links to the source of the changes either structured or in the comments.
• I've run go generate . to ensure that Schemas and Regime data are up to date.
• All linter warnings have been reviewed and fixed.
• I've been obsessive with pointer nil checks to avoid panics.
• The CHANGELOG.md has been updated with an overview of my changes.
• Requested a review from @samlown.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.21%. Comparing base (34e317a) to head (88f0519).
Report is 18 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #444   +/-   ##
=======================================
  Coverage   82.21%   82.21%           
=======================================
  Files         238      238           
  Lines       11751    11751           
=======================================
  Hits         9661     9661           
  Misses       1727     1727           
  Partials      363      363           

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[samlown]

I don't think semantic details like this should be in GOBL, these are more implementation details.