fix: auto-extract untranspiled monorepo packages

[andrew8088]

🔗 Linked issue

#332

❓ 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 change resolve #332, so you can auto-extract packages within the same pnpm workspace/monorepo from their source files. Currently, this works by checking the main export in the package.json file; if it's a typescript file, then scan it like a local directory.

TBH, though, this is not my area of expertise, so more than happy to change this ... or close it, if I'm using unimport wrong :) .

📝 Checklist

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