issues/267: add mux Resolve function

[komuw]

What:

• Add mux Resolve function
• Imagine a customer calls and says they tried to access the url https://localhost/check/888, they expected to see a photo of a shark instead they saw a photo of an egg. How do you know which code/handler you should go look at, out of 10_000 handlers?
• It is inspired by django's resolve url utility[3].

Why:

1. Fixes: mux: add url resolve function #267
2. This enhances debugging.
3. https://docs.djangoproject.com/en/4.2/ref/urlresolvers/#django.urls.resolve

[codecov-commenter]

Codecov Report

Patch coverage: 92.30% and project coverage change: +0.48 🎉

Comparison is base (ce5ce80) 77.58% compared to head (feba7a9) 78.06%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #268      +/-   ##
==========================================
+ Coverage   77.58%   78.06%   +0.48%     
==========================================
  Files          36       36              
  Lines        3337     3360      +23     
==========================================
+ Hits         2589     2623      +34     
+ Misses        623      612      -11     
  Partials      125      125              

Impacted Files	Coverage Δ
mux/mux.go	76.11% <83.33%> (+4.96%)	⬆️
mux/route.go	98.26% <100.00%> (+11.34%)	⬆️

☔ View full report in Codecov by Sentry.
📢 Do you have feedback about the report comment? Let us know in this issue.