feat(externals): support tracing orphan files in node_modules

[pi0]

🔗 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)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

There are some files in node_modules without a parent package.json (perisma for example generates node_modules/.prisma without .prisma/package.json.

This PR supports tracing and copying them using a virtual package

📝 Checklist

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

[codecov]

Codecov Report

Merging #865 (05d7990) into main (63e250d) will decrease coverage by 0.02%.
The diff coverage is 94.59%.

@@            Coverage Diff             @@
##             main     #865      +/-   ##
==========================================
- Coverage   67.13%   67.12%   -0.02%     
==========================================
  Files          59       59              
  Lines        5785     5797      +12     
  Branches      614      616       +2     
==========================================
+ Hits         3884     3891       +7     
- Misses       1893     1897       +4     
- Partials        8        9       +1     

Impacted Files	Coverage Δ
src/rollup/plugins/externals.ts	94.63% <94.59%> (+0.14%)	⬆️
src/rollup/config.ts	91.66% <0.00%> (-0.93%)	⬇️
src/utils/index.ts	51.30% <0.00%> (-0.53%)	⬇️

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