Add instance attribute annotations to all classes

[duckontheweb]

Related Issue(s):

• Closes Create type annotations for attributes  #321

Description:

Adds type annotations for instance attributes for all classes. Where the class docstring had an Attributes section, I removed those and added a docstring on each type annotation.

PR Checklist:

• Code is formatted (run pre-commit run --all-files)
• 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.

[duckontheweb]

@l0b0 Since you've done so much work on type hints in this library it would be great to get your input as well.

[codecov-commenter]

Codecov Report

Merging #705 (83a8410) into main (f68cf81) will increase coverage by 0.05%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #705      +/-   ##
==========================================
+ Coverage   94.20%   94.25%   +0.05%     
==========================================
  Files          77       77              
  Lines       11120    11217      +97     
  Branches     1337     1337              
==========================================
+ Hits        10476    10573      +97     
  Misses        466      466              
  Partials      178      178              

Impacted Files	Coverage Δ
pystac/cache.py	92.74% <100.00%> (+0.43%)	⬆️
pystac/catalog.py	92.13% <100.00%> (+0.13%)	⬆️
pystac/collection.py	94.21% <100.00%> (+0.30%)	⬆️
pystac/extensions/eo.py	93.15% <100.00%> (+0.03%)	⬆️
pystac/extensions/file.py	92.18% <100.00%> (+0.18%)	⬆️
pystac/extensions/hooks.py	81.03% <100.00%> (+0.33%)	⬆️
pystac/extensions/item_assets.py	84.44% <100.00%> (+0.35%)	⬆️
pystac/extensions/label.py	93.75% <100.00%> (+0.10%)	⬆️
pystac/extensions/pointcloud.py	97.81% <100.00%> (+0.05%)	⬆️
pystac/extensions/raster.py	89.78% <100.00%> (+0.11%)	⬆️
... and 8 more

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[schwehr]

Thanks for working on this!