Add fill mask to inference client

[martinbrose]

Add fill-mask to HuggingFace🤗 Hub

References #1539

This is an ongoing list of model tasks to implement in the Hugging Face Hub inference client. Each task is planned to be its own PR. The task for this is fill-mask.

Key Features

• Modifies _client.py to call a fill-mask model.
• Modifies testing and documentation to reflect changes.

[HuggingFaceDocBuilderDev]

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

[codecov]

Codecov Report

Patch coverage: 76.92% and project coverage change: +32.23% 🎉

Comparison is base (0fbbf6b) 49.57% compared to head (f735f4f) 81.81%.

❗ Current head f735f4f differs from pull request most recent head 125906a. Consider uploading reports for the commit 125906a to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #1613       +/-   ##
===========================================
+ Coverage   49.57%   81.81%   +32.23%     
===========================================
  Files          62       60        -2     
  Lines        7014     6790      -224     
===========================================
+ Hits         3477     5555     +2078     
+ Misses       3537     1235     -2302     

Files Changed	Coverage Δ
...gingface_hub/inference/_generated/_async_client.py	58.37% <25.00%> (+36.14%)	⬆️
src/huggingface_hub/inference/_client.py	79.51% <100.00%> (+55.65%)	⬆️
src/huggingface_hub/inference/_types.py	96.15% <100.00%> (-1.15%)	⬇️

... and 43 files with indirect coverage changes

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[Wauplin]

One more! 🙏 🤗

[HuggingFaceDocBuilderDev]

The docs for this PR live here. All of your documentation changes will be reflected on that endpoint.