Add Url::resolve()

[Baptouuuu]

This new method replaces the package innmind/url-resolver and fixes parsing relative paths

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.13%. Comparing base (cb04175) to head (5ed18a3).

Additional details and impacted files

@@              Coverage Diff              @@
##             develop      #12      +/-   ##
=============================================
- Coverage      99.18%   99.13%   -0.05%     
- Complexity       261      283      +22     
=============================================
  Files             33       33              
  Lines           1227     1392     +165     
=============================================
+ Hits            1217     1380     +163     
- Misses            10       12       +2     

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