feat: http proxy util

[pi0]

🔗 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

This PR adds HTTP proxy support to node-fetch-native using a new subpath export.

Sadly it adds ~500KB to the bundle but since Node.js is not going to soon make any attempt for built in HTTP proxy support and installing deps for all runtime versions of node takes much more without bundling.

📝 Checklist

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