feat: add withFragment utility

[IgnisDa]

Fixes #190.

[IgnisDa]

@pi0 should I rename the function to withFragment?

[pi0]

I am thinking about it. hash can be confusing with hashing functions specially when we globally auto import ufo utils and fragment is the more technical naming for it. Where as i saw URL class has hash property.

But i think it is safer to go with withFragment 👍🏼

[IgnisDa]

@pi0 made the changes

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (9c1d90e) 95.27% compared to head (16acb71) 95.34%.
Report is 14 commits behind head on main.

❗ Current head 16acb71 differs from pull request most recent head 7dbe05c. Consider uploading reports for the commit 7dbe05c to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #193      +/-   ##
==========================================
+ Coverage   95.27%   95.34%   +0.06%     
==========================================
  Files           7        7              
  Lines         867      880      +13     
  Branches      187      190       +3     
==========================================
+ Hits          826      839      +13     
  Misses         41       41              

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