new addon for italian scontrino

[alvarolivie]

The adecf addon is currently based on information from the AdE.
As no official Italian framework for uploading this type of document is yet in place, this addon must be treated as a work in progress. We cannot be sure that the format that the Italian government require will not change.

Cannot check for nil supplier or nil tax as GOBL will reject the invoice before it reaches this addon's validation.

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 90.97744% with 12 lines in your changes missing coverage. Please review.

Project coverage is 87.41%. Comparing base (2015886) to head (b70ab84).
Report is 21 commits behind head on main.

Files with missing lines	Patch %	Lines
addons/it/ticket/invoices.go	88.00%	4 Missing and 2 partials ⚠️
addons/it/ticket/tax.go	81.81%	4 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #460      +/-   ##
==========================================
+ Coverage   87.38%   87.41%   +0.03%     
==========================================
  Files         264      268       +4     
  Lines       13628    13759     +131     
==========================================
+ Hits        11909    12028     +119     
- Misses       1373     1381       +8     
- Partials      346      350       +4     

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[samlown]

Looking great! Almost there. A few minor suggestions. For sure we should rename.

[samlown]

All looking good 👍 nice!