feat: add is-status(code)within-range methods

[tsinis]

Description

Type of Change

• ✨ New feature (non-breaking change which adds functionality)
• 🛠️ Bug fix (non-breaking change which fixes an issue)
• ❌ Breaking change (fix or feature that would cause existing functionality to change)
• 🧹 Code refactor
• ✅ Build configuration change
• 🧪 Tests
• 📝 Documentation
• ⚙️ CI/CD or GitHub Workflow configuration change
• 📦 Dependencies update

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.48%. Comparing base (9e0d695) to head (d965fc0).

❗ Current head d965fc0 differs from pull request most recent head 28b8700

Please upload reports for the commit 28b8700 to get more accurate results.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #64      +/-   ##
==========================================
- Coverage   95.58%   95.48%   -0.10%     
==========================================
  Files           2        2              
  Lines         136      133       -3     
==========================================
- Hits          130      127       -3     
  Misses          6        6              

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[codefactor-io]

CodeFactor found an issue: Use 'const' for final variables initialized to a constant value.

It's currently on:
test\src\num_status_code_extension_test.dart:15
Commit d965fc0

It cannot be const because of the .first.