feat: persist and reuse generated https certificates

[Mastercuber]

🔗 Linked issue

closes #132

❓ Type of change

• [ ] 📖 Documentation (updates to the documentation, readme, or JSdoc annotations)
• [ ] 🐞 Bug fix (a non-breaking change that fixes an issue)
• [x] 👌 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

In this PR a new flag (--https.reuse) is introduced to be able to reuse previosly autogenerated certificates, instead of generating them every time listhen is restarted.

📝 Checklist

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

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 52.54237% with 28 lines in your changes are missing coverage. Please review.

Project coverage is 50.48%. Comparing base (d115045) to head (55cc0fd). Report is 14 commits behind head on main.

Files	Patch %	Lines
src/_cert.ts	57.69%	22 Missing :warning:
src/cli.ts	0.00%	6 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #136      +/-   ##
==========================================
+ Coverage   49.42%   50.48%   +1.06%     
==========================================
  Files          17       17              
  Lines        1819     1844      +25     
  Branches      147      148       +1     
==========================================
+ Hits          899      931      +32     
+ Misses        915      908       -7     
  Partials        5        5              

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[gkkirilov]

@pi0 Is there something else needed for this to get merged?