feat: tunnel support via unjs/untun and cloudflared (experimental)

[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

This PR supports out-of-the-box tunnel support using Cloudflare Tunnel.

Since the cloudflared is a native binary, I have used fantastic work by @JacobLinCool JacobLinCool/cloudflared as base of a fork (main change is that we have no post-install script and only download binary on demand). License added and I hope sometime we can collaborate to move the main package to the mainstream.

Comparing current free tunnel services, Cloudflare has currently the most generous offer. However, I am fully open to supporting other drivers later on via configuration (and set default with the most reliable option).

Update: Moved to newborn unjs/untun

📝 Checklist

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

[codecov]

Codecov Report

Merging #102 (b7b3ff0) into main (bd2b5d6) will increase coverage by 0.99%.
Report is 1 commits behind head on main.
The diff coverage is 75.82%.

❗ Current head b7b3ff0 differs from pull request most recent head b05b6ad. Consider uploading reports for the commit b05b6ad to get more accurate results

@@            Coverage Diff             @@
##             main     #102      +/-   ##
==========================================
+ Coverage   49.93%   50.93%   +0.99%     
==========================================
  Files          10       10              
  Lines        1568     1608      +40     
  Branches      108      115       +7     
==========================================
+ Hits          783      819      +36     
- Misses        785      789       +4     

Files Changed	Coverage Δ
src/_utils.ts	55.42% <66.66%> (-0.68%)	⬇️
src/listen.ts	84.25% <71.62%> (+0.91%)	⬆️
src/lib/open/index.ts	17.83% <100.00%> (+0.18%)	⬆️
src/types.ts	100.00% <100.00%> (ø)