perf(resolver): stat absolute paths once in fast path

[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

When the internal _resolve method detects an absolute URL, it calls fs stat twice once for checking the existence and once for following links. This can be combined into one.

Also since resolution already follows symlinks, it is unnecessary to call it again.

(added tests)

📝 Checklist

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