Added loader from HF spaces

[pawelknes]

Added a possibility to load data from Huggingface spaces as per #857

[codecov]

Codecov Report

Attention: Patch coverage is 87.50000% with 4 lines in your changes are missing coverage. Please review.

Project coverage is 91.56%. Comparing base (4064804) to head (42ff0e4).
Report is 14 commits behind head on main.

❗ Current head 42ff0e4 differs from pull request most recent head 4cad6dd

Please upload reports for the commit 4cad6dd to get more accurate results.

Files	Patch %	Lines
src/unitxt/loaders.py	83.33%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #860      +/-   ##
==========================================
- Coverage   92.06%   91.56%   -0.51%     
==========================================
  Files         104      104              
  Lines       10738    10977     +239     
==========================================
+ Hits         9886    10051     +165     
- Misses        852      926      +74     

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[yoavkatz]

Thanks. Looks good. One request regarding token in the API.

[elronbandel]

Well done. Can you make sure it works like other loaders with loader_limit? If its too complicated we can discuss leaving it aside for now

[pawelknes]

Well done. Can you make sure it works like other loaders with loader_limit? If its too complicated we can discuss leaving it aside for now

I made the loader inherit from LoadHF since the only difference is that it needs to download the data first, and then it operates on HF dataset as well