Add support for downloading models from huggingface

[HCookie]

Add support for huggingface

Models will be downloaded from huggingface through specification in the config.

checkpoint:
  huggingface:
    repo_id: "ecmwf/aifs-single"
    filename: "aifs_single_v0.2.1.ckpt"

---

📚 Documentation preview 📚: https://anemoi-inference--75.org.readthedocs.build/en/75/

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 75.00%. Comparing base (b1d2560) to head (bfe73f0).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop      #75   +/-   ##
========================================
  Coverage    75.00%   75.00%           
========================================
  Files            1        1           
  Lines            4        4           
========================================
  Hits             3        3           
  Misses           1        1           

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