feat: pass resolved config to rollup:before hook

[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 allows modifying the resolved rollup config.

📝 Checklist

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

[pi0]

This looks good but can you please also explain the usecase for this extend?

[danielroe]

I have no specific current use case but in past I've had to work around this because otherwise there is no hook or way to update the generated rollup config.

[codecov]

Codecov Report

Merging #1160 (064b57b) into main (490f0ab) will decrease coverage by 0.13%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #1160      +/-   ##
==========================================
- Coverage   67.90%   67.77%   -0.13%     
==========================================
  Files          66       66              
  Lines        6486     6486              
  Branches      719      716       -3     
==========================================
- Hits         4404     4396       -8     
- Misses       2067     2075       +8     
  Partials       15       15              

Impacted Files	Coverage Δ
src/build.ts	42.85% <100.00%> (ø)
src/rollup/config.ts	87.99% <100.00%> (-0.44%)	⬇️
src/types/nitro.ts	100.00% <100.00%> (ø)

... and 1 file with indirect coverage changes

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