new addon for italian scontrino

[alvarolivie]

• Initialised scontrino addon

Pre-Review Checklist

• 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 to 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 the 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

Attention: Patch coverage is 0% with 62 lines in your changes missing coverage. Please review.

Project coverage is 85.25%. Comparing base (b86e5d8) to head (45a8580).

Files with missing lines	Patch %	Lines
addons/it/scontrino/invoices.go	0.00%	41 Missing ⚠️
addons/it/scontrino/scontrino.go	0.00%	21 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #460      +/-   ##
==========================================
- Coverage   85.67%   85.25%   -0.43%     
==========================================
  Files         255      257       +2     
  Lines       12582    12644      +62     
==========================================
  Hits        10780    10780              
- Misses       1454     1516      +62     
  Partials      348      348              

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.