FIX url encoding in hf_hub_url

[Wauplin]

Fix #1161. Bug doesn't seem to be elsewhere than in hf_hub_url itself.
Added 2 regression tests just to be sure.

cc @philschmid thanks for reporting it :)

(just wondering for myself: who really thought it was a good idea to have a ? in a filename ??? 😄)

[HuggingFaceDocBuilderDev]

The documentation is not available anymore as the PR was closed or merged.

[codecov]

Codecov Report

Base: 84.57% // Head: 84.62% // Increases project coverage by +0.04% 🎉

Coverage data is based on head (7fe264c) compared to base (9ccdf02).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1164      +/-   ##
==========================================
+ Coverage   84.57%   84.62%   +0.04%     
==========================================
  Files          42       42              
  Lines        4182     4182              
==========================================
+ Hits         3537     3539       +2     
+ Misses        645      643       -2     

Impacted Files	Coverage Δ
src/huggingface_hub/file_download.py	88.48% <ø> (+0.60%)	⬆️

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