Use singular field key names: include and exclude

[kurtmckee]

Related Issue(s):

• Fields extension uses incorrect plural includes and excludes #689

Description:

This PR updates the names of the Fields extension keys. Previously they were plural (includes / excludes) but this did not align with the Fields extension documentation, and did not work when interacting with a STAC API. The keys are renamed to include and exclude by this PR.

PR Checklist:

• Code is formatted
• Tests pass
• Changes are added to the CHANGELOG

Fixes #689

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.87%. Comparing base (21435b0) to head (9bb4055).
Report is 42 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #690      +/-   ##
==========================================
+ Coverage   93.43%   93.87%   +0.44%     
==========================================
  Files          13       13              
  Lines         990      996       +6     
==========================================
+ Hits          925      935      +10     
+ Misses         65       61       -4     

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[gadomski]

LGTM, thanks for the fix! I added a VCR test against Earth Search to check a real world example as well.