feat: allow dispatcher (undici) option and add proxy docs

[pi0]

• build: add top level react-native field
• feat: allow dispatcher (undici) option

🔗 Linked issue

❓ Type of change

• 📖 Documentation (updates to the documentation, readme, or JSdoc annotations)
• 🐞 Bug fix (a non-breaking change that fixes an issue)
• 👌 Enhancement (improving an existing functionality like performance)
• ✨ New feature (a non-breaking change that adds functionality)
• 🧹 Chore (updates to the build process or auxiliary tools and libraries)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

While already possible without type support, this PR adds docs, example and type for dispatcher option allowing to provide proxy for modern Node.js

📝 Checklist

• I have linked an issue or discussion.
• I have updated the documentation accordingly.

[codecov]

Codecov Report

Merging #308 (13b1965) into main (03680dd) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #308   +/-   ##
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  Coverage   92.00%   92.00%           
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  Files           5        5           
  Lines         450      450           
  Branches      102      102           
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  Hits          414      414           
  Misses         36       36