Implement classification v2.0.0

[gadomski]

Related Issue(s):

• Closes Update Classification extension to support v2.0.0 spec #1354

Description:

• Adds the new nodata, percentage, and count fields
• Makes description optional
• Make name required
• Removes a copy-pasta double-check of the color hint

PR Checklist:

• pre-commit hooks pass locally
• Tests pass (run scripts/test)
• 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.

[codecov]

Codecov Report

Attention: Patch coverage is 69.76744% with 13 lines in your changes missing coverage. Please review.

Project coverage is 91.07%. Comparing base (a2a8e5b) to head (c548f90).
Report is 47 commits behind head on main.

Files with missing lines	Patch %	Lines
pystac/extensions/classification.py	69.76%	8 Missing and 5 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1359      +/-   ##
==========================================
- Coverage   91.22%   91.07%   -0.15%     
==========================================
  Files          51       51              
  Lines        7042     7070      +28     
  Branches     1008     1012       +4     
==========================================
+ Hits         6424     6439      +15     
- Misses        443      451       +8     
- Partials      175      180       +5     

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[jsignell]

Mostly concerned about the change in arg order, but otherwise looks good!

[jsignell]

LGTM - thanks for absorbing the nits

[gadomski]

thanks for absorbing the nits

You betcha, thanks for the careful checks!