feat: export type helpers

[danielroe]

🔗 Linked issue

nuxt/nuxt#23696

❓ 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 exports type helpers matching the functions/return types of the helpers scule offers.

Ideally this should mean if #57 lands, we can just update the implementation of these types rather than have a breaking change.

📝 Checklist

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

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (21f19ba) 100.00% compared to head (210f720) 100.00%.
Report is 3 commits behind head on main.

❗ Current head 210f720 differs from pull request most recent head 3e4cd49. Consider uploading reports for the commit 3e4cd49 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##              main       #58    +/-   ##
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  Coverage   100.00%   100.00%            
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  Files            1         2     +1     
  Lines          131       338   +207     
  Branches        35        36     +1     
==========================================
+ Hits           131       338   +207     

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