Use PropertiesExtension._get_property in table extension

[duckontheweb]

Related Issue(s):

• Closes extensions/table.py: Not compatible with pytype #677

Description:

Uses PropertiesExtension._get_property in TableExtension to properly set return type.

There are no other extensions classes inheriting from PropertiesExtension that have a similar issue, but there are a number of similar bad-return-type errors from pytype resulting from vague typing in the summaries module and in some of the other dict-like classes in the extension modules. I will open a separate PR to address the typing issues in the summaries module, and I think the typing issues with the other dict-like classes would be best addressed in a PR that implements some of the JSON serde logic suggested in #700 (comment) and begun in #617.

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.

[codecov-commenter]

Codecov Report

Merging #712 (75f78c0) into main (5cff27d) will not change coverage.
The diff coverage is 0.00%.

❗ Current head 75f78c0 differs from pull request most recent head 98e60e2. Consider uploading reports for the commit 98e60e2 to get more accurate results

@@           Coverage Diff           @@
##             main     #712   +/-   ##
=======================================
  Coverage   94.20%   94.20%           
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  Files          77       77           
  Lines       11130    11130           
  Branches     1340     1340           
=======================================
  Hits        10485    10485           
  Misses        466      466           
  Partials      179      179           

Impacted Files	Coverage Δ
pystac/extensions/table.py	69.93% <0.00%> (ø)

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