feat: automatically fallback hostname for invalid hosts

[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

resolves #57

When hostname is (misconfigured) and invalid, instead of throwing a hard error, get-port listens on a fallback (IPv4) hostname (127.0.0.1 or 0.0.0.0 if public flag is explicitly set)

📝 Checklist

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

[codecov]

Codecov Report

Merging #62 (666ca9a) into main (7d4d6bb) will increase coverage by 1.14%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #62      +/-   ##
==========================================
+ Coverage   85.20%   86.35%   +1.14%     
==========================================
  Files           5        5              
  Lines         365      381      +16     
  Branches       47       48       +1     
==========================================
+ Hits          311      329      +18     
+ Misses         54       52       -2     

Files Changed	Coverage Δ
src/_internal.ts	89.58% <100.00%> (+3.70%)	⬆️
src/get-port.ts	74.85% <100.00%> (+0.61%)	⬆️
src/types.ts	100.00% <100.00%> (ø)