feat(xliff): initial implementation of xliff format

[timofei-iatsenko]

Description

Related: #1675

Todo List:

• Serialization Lingui Catalog to the XLIFF format
• Parsing XLIFF format to the Lingui Catalog
  • Preserve attributes on the trans-unit such as state="final"
  • Preserve children which might be added to trans-unit by TMS
  • Ideally when lingui updates xliff files it should touch only related fields and left the rest of the document as-is, this will ensure no custom properties or elements are lost during merging.
• Documentation update

Types of changes

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update

Fixes # (issue)

Checklist

• I have read the CONTRIBUTING and CODE_OF_CONDUCT docs
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
js-lingui	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	May 26, 2023 11:13am

[github-actions]

size-limit report 📦

Path	Size
./packages/core/dist/index.mjs	1.44 KB (0%)
./packages/detect-locale/dist/index.mjs	721 B (0%)
./packages/react/dist/index.mjs	1.59 KB (0%)
./packages/remote-loader/dist/index.mjs	7.24 KB (0%)

[codecov]

Codecov Report

Patch coverage: 88.88% and project coverage change: +0.11 🎉

Comparison is base (894c877) 75.72% compared to head (6e28cf9) 75.83%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1676      +/-   ##
==========================================
+ Coverage   75.72%   75.83%   +0.11%     
==========================================
  Files          79       80       +1     
  Lines        2039     2057      +18     
  Branches      524      527       +3     
==========================================
+ Hits         1544     1560      +16     
- Misses        379      381       +2     
  Partials      116      116              

Impacted Files	Coverage Δ
packages/format-xliff/src/xliff.ts	88.88% <88.88%> (ø)

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