feat(format-po): configure header attributes in PO file formatter

[mariarchy]

Description

Support adding custom header attributes to the PO message catalog via the PO formatter config

This is particularly useful for localization tools that require custom PO file headers. For instance, CrowdIn requires the addition of a custom header attribute to enable a specific PO file parsing setting (more here)

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
• Examples update

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 the necessary documentation (if appropriate)

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Name	Status	Preview	Comments	Updated (UTC)
js-lingui	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	May 14, 2024 9:20am

[github-actions]

size-limit report 📦

Path	Size
./packages/core/dist/index.mjs	2.87 KB (0%)
./packages/detect-locale/dist/index.mjs	723 B (0%)
./packages/react/dist/index.mjs	1.67 KB (0%)
./packages/remote-loader/dist/index.mjs	7.26 KB (0%)

[timofei-iatsenko]

Looks good. Thanks for contribution.

There is an issue with a prettier, you probably didn't format code using it.

[timofei-iatsenko]

Please also update a readme file for this package.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 76.03%. Comparing base (d6b9698) to head (afeae4a).
Report is 20 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1934      +/-   ##
==========================================
- Coverage   76.65%   76.03%   -0.63%     
==========================================
  Files          81       85       +4     
  Lines        2090     2111      +21     
  Branches      533      540       +7     
==========================================
+ Hits         1602     1605       +3     
- Misses        375      393      +18     
  Partials      113      113              

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[mariarchy]

done! thanks for the prompt review @thekip

[andrii-bodnar]

@mariarchy thanks for the contribution!