Add x-request-id to every request

[Wauplin]

On a suggestion from @XciD, this PR adds a custom x-request-id header in all calls made to the Hub. The request id is unique (uuid4()) and changes in each http call. The idea is to help debugging issues even when a 504 Gateway timeout is raised. At the moment, if the request id is created server-side but a 504 happens, the request id is not sent back to the client, making it much harder to track the issue in our logs.

cc @Pierrci @julien-c this shouldn't change anything for moon-landing

(I've also added a local debug log to help with it)

[HuggingFaceDocBuilderDev]

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

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +2.14 🎉

Comparison is base (e4a419b) 80.12% compared to head (782f233) 82.27%.

❗ Current head 782f233 differs from pull request most recent head 3413f97. Consider uploading reports for the commit 3413f97 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1518      +/-   ##
==========================================
+ Coverage   80.12%   82.27%   +2.14%     
==========================================
  Files          58       57       -1     
  Lines        6268     6120     -148     
==========================================
+ Hits         5022     5035      +13     
+ Misses       1246     1085     -161     

Impacted Files	Coverage Δ
src/huggingface_hub/utils/_http.py	100.00% <100.00%> (ø)

... and 28 files with indirect coverage changes

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