feat: public option and --host flag to disable network expose in development by default

[pi0]

🔗 Linked issue

resolves #88

❓ 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 introduces a new public option (available as --host cli flag implicitly with vite cli consistancy) that controls whether by default we should listen to the public network interfaces or not.

If the option is not explicitly being set, we infer it first by checking (explicit) hostname if being localhost to disable and then fallback to env check and only enable public by default for production (more compatibility) and disable for development (more security).

I suppose this is a safe nonbreaking change especially since we keep production behavior as-is, support and show --host flag and anyway main consumers (nuxt and nitro) are introducing this feature in the non major version. But also open to make development default and release a major version if too much trouble in the ecosystem happened which I guess won't unless there is a special complex setup. /cc @danielroe @antfu

📝 Checklist

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

[codecov]

Codecov Report

Merging #98 (48f29c4) into main (aba93a8) will decrease coverage by 2.04%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #98      +/-   ##
==========================================
- Coverage   51.70%   49.67%   -2.04%     
==========================================
  Files          10       10              
  Lines        1497     1516      +19     
  Branches      111      101      -10     
==========================================
- Hits          774      753      -21     
- Misses        723      763      +40     

Files Changed	Coverage Δ
src/listen.ts	83.10% <100.00%> (-9.62%)	⬇️
src/types.ts	100.00% <100.00%> (ø)

... and 1 file with indirect coverage changes