refactor: remove strings support from `LinguiConfig.extractors`

[timofei-iatsenko]

Description

I believe it wasn't used, because it was even not documented.

I removed this ability for simplicity and future ESM support. Related migration notice added.

Types of changes

• [ ] Bugfix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [x] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] Documentation update
• [ ] Examples 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 the necessary documentation (if appropriate)

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Name	Status	Preview	Updated (UTC)
js-lingui	✅ Ready (Inspect)	Visit Preview	Oct 16, 2024 3:26pm

[github-actions[bot]]

size-limit report 📦

Path	Size
./packages/core/dist/index.mjs	3.09 KB (0%)
./packages/detect-locale/dist/index.mjs	723 B (0%)
./packages/react/dist/index.mjs	1.65 KB (0%)
./packages/remote-loader/dist/index.mjs	7.26 KB (0%)