feat: findTypeExports for finding type exports

[danielroe]

🔗 Linked issue

❓ Type of change

• 📖 Documentation (updates to the documentation or readme)
• 🐞 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 adds support for finding type exports which might be useful for type auto-import downstream in unimport (unjs/unimport#218) - as well as in https://github.com/unjs/mkdist (unjs/mkdist#134).

📝 Checklist

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

[codecov]

Codecov Report

Merging #156 (23237ac) into main (8368caa) will increase coverage by 0.66%.
The diff coverage is 96.51%.

@@            Coverage Diff             @@
##             main     #156      +/-   ##
==========================================
+ Coverage   84.53%   85.20%   +0.66%     
==========================================
  Files           8        8              
  Lines         802      865      +63     
  Branches      145      156      +11     
==========================================
+ Hits          678      737      +59     
- Misses        124      128       +4     

Impacted Files	Coverage Δ
src/analyze.ts	97.72% <96.51%> (-0.90%)	⬇️

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[antfu]

In general, it LGTM!

[pi0]

💯