Add support for S3 in HubModel

[martinkim0]

• Add pull_from_s3 method to initialize a HubModel
• Allow different ways of passing in credentials
• Add public test files to s3 bucket
• Add tests
• Add push to s3 method
• Authenticate AWS in GitHub actions

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (6078041) 89.17% compared to head (3f44406) 89.41%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2378      +/-   ##
==========================================
+ Coverage   89.17%   89.41%   +0.23%     
==========================================
  Files         153      153              
  Lines       12518    12564      +46     
==========================================
+ Hits        11163    11234      +71     
+ Misses       1355     1330      -25     

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[canergen]

Working. It would be good to check cache_dir exists and otherwise create it.

[canergen]

LGTM