add cf extension

[ahenrij]

Description: Add support for the CF Extension

PR Checklist:

• Pre-commit hooks pass (run pre-commit run --all-files)
• Tests pass (run pytest)
• Documentation has been updated to reflect changes, if applicable
• This PR maintains or improves overall codebase code coverage.
• Changes are added to the CHANGELOG. See the docs for information about adding to the changelog.

[ahenrij]

FYI @fmigneault

[codecov]

Codecov Report

❌ Patch coverage is 0% with 95 lines in your changes missing coverage. Please review.
✅ Project coverage is 91.29%. Comparing base (065a631) to head (daa7454).

Files with missing lines	Patch %	Lines
pystac/extensions/cf.py	0.00%	95 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1592      +/-   ##
==========================================
- Coverage   92.32%   91.29%   -1.04%     
==========================================
  Files          55       56       +1     
  Lines        8381     8476      +95     
  Branches      966      973       +7     
==========================================
  Hits         7738     7738              
- Misses        457      552      +95     
  Partials      186      186              

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[fmigneault]

Hi @gadomski
We would like to leverage a new pystac release providing this PR's extension to facilitate integration in downstream packages. Is there anything blocking that could be done on our end to help in its integration?
Thanks

[gadomski]

Is there anything blocking that could be done on our end to help in its integration?

Nope, this is in my queue to review, I just haven't gotten to it yet.