feat: add isScriptProtocol util

[danielroe]

🔗 Linked issue

nuxt/nuxt#22366

❓ 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 allows checking for protocol existence with hasProtocol('https://test.com', { script: false }), in cases where we want to safely redirect to an external URL.

API thoughts welcome.

📝 Checklist

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

[codecov]

Codecov Report

Merging #156 (3e080f2) into main (7fa45a0) will decrease coverage by 0.22%.
The diff coverage is 60.00%.

@@            Coverage Diff             @@
##             main     #156      +/-   ##
==========================================
- Coverage   94.86%   94.64%   -0.22%     
==========================================
  Files           7        7              
  Lines         798      803       +5     
  Branches      171      171              
==========================================
+ Hits          757      760       +3     
- Misses         41       43       +2     

Files Changed	Coverage Δ
src/utils.ts	99.09% <60.00%> (-0.91%)	⬇️