Add token attribute to HfApi

[Wauplin]

Fix #1104 and #796.

A token attribute is now added to HfApi so that it's sent in all API calls but not persisted on the machine.

from huggingface_hub import HfApi

hf_api = HfApi(
   endpoint="https://huggingface.co", # Can be a Private Hub endpoint.
   token="hf_xxx", # Token is not persisted on the machine.
)
 models = hf_api.list_models() # private models as well !

TODOs:

• implement attribute
• adapt test suite 🎉
• documentation

[HuggingFaceDocBuilderDev]

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

[codecov]

Codecov Report

Base: 84.20% // Head: 84.22% // Increases project coverage by +0.01% 🎉

Coverage data is based on head (f6b4de9) compared to base (9169c09).
Patch coverage: 95.23% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1116      +/-   ##
==========================================
+ Coverage   84.20%   84.22%   +0.01%     
==========================================
  Files          40       40              
  Lines        4007     4012       +5     
==========================================
+ Hits         3374     3379       +5     
  Misses        633      633              

Impacted Files	Coverage Δ
src/huggingface_hub/hf_api.py	87.40% <95.23%> (+0.08%)	⬆️

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[adrinjalali]

Nice!