feat: improve typed headers

[GalacticHypernova]

🔗 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 is something I thought about for a while. Since we have header intellisense, we might as well have value intellisense. This will ensure no wrong header values are set and would save time debugging header issues (a common example of this is the misconception that image/jpg is a valid content type, when in reality it doesn't have a universally acceptable type). Granted, this won't be a complete intellisense for all possible values as the value combinations can be endless, however it would give a good foundation.
EDIT: As of today, I have decided to expand this further and include status codes (maybe something else as well)

📝 Checklist

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

[GalacticHypernova]

Marking this as draft as this is very early in development. I will gradually add everything I can, but it will take a good while.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.47%. Comparing base (a58d7c9) to head (b57497a).
Report is 76 commits behind head on main.

❗ Current head b57497a differs from pull request most recent head e935c8c

Please upload reports for the commit e935c8c to get more accurate results.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #625      +/-   ##
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+ Coverage   77.83%   79.47%   +1.64%     
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  Files          47       54       +7     
  Lines        4286     5346    +1060     
  Branches      611      675      +64     
==========================================
+ Hits         3336     4249     +913     
- Misses        933     1078     +145     
- Partials       17       19       +2     

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[GalacticHypernova]

I believe this has covered everything in the scope of the PR. If I missed anything in any other function where it can be improved, please let me know and I'll gladly add it.

There are a few things I would like to change, like the AnyType usage, but I do need a tiny bit of help in figuring out how to properly take care of multi-value parameter-included headers (like www-authenticate), especially when used inside strings as that could probably mitigate the use of AnyType entirely.

That being said, I understand it can't be full-proof, and therefore I think this is good as a baseline intellisense.

[pi0]

Thanks!

(in summary made refactors to improve maintainability + relax types to only hint and still allow artibrary string/number as input)

[GalacticHypernova]

Glad I can help!
Though as an http framework, shouldn't it conform to http specs and enforce officially-recognized status codes? I can't seem to find much use in allowing arbitrary status codes..