Add support for other tax categories to myDATA addon

[cavalle]

Describe your changes

This PR adds support for other tax categories to the myDATA addon.

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 82.90%. Comparing base (302269b) to head (d596396).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #446      +/-   ##
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+ Coverage   82.88%   82.90%   +0.02%     
==========================================
  Files         242      242              
  Lines       11875    11875              
==========================================
+ Hits         9842     9845       +3     
+ Misses       1672     1670       -2     
+ Partials      361      360       -1     

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[samlown]

I don't like "other tax" for the name, it feels really confusing, but my "misc" suggestion is not much better. If you're happy with "other", we can go with that.

[cavalle]

I don't like "other tax" for the name, it feels really confusing, but my "misc" suggestion is not much better. If you're happy with "other", we can go with that.

I agree that, out of context, "other tax" feels confusing. However, in the context of myDATA, the "other tax" term is used consistently: in a couple of field names (otherTaxesPercentCategory and otherTaxesAmount), and in the official English version of the docs (screenshot below). For that reason, in the lack of a better alternative, I'd rather a name that directly maps to that naming.