Update Timestamps Extension

[duckontheweb]

Related Issue(s):

• Update extension pydoc strings to match new extension architecture #326
• Implement collection summary functionality #327

Description:

• Update docstring and adds Summaries for Timestamps Extension
• Defines equality and __repr__ for RangeSummary (cherry picked from Update Satellite Extension #509, so there should be no conflict)

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 #513 (4870116) into main (a4fe4cd) will increase coverage by 0.07%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #513      +/-   ##
==========================================
+ Coverage   93.96%   94.03%   +0.07%     
==========================================
  Files          71       71              
  Lines        9991    10076      +85     
  Branches     1061     1068       +7     
==========================================
+ Hits         9388     9475      +87     
+ Misses        434      432       -2     
  Partials      169      169              

Impacted Files	Coverage Δ
pystac/extensions/eo.py	94.33% <ø> (ø)
pystac/extensions/timestamps.py	100.00% <100.00%> (+2.89%)	⬆️
pystac/summaries.py	76.72% <100.00%> (+0.91%)	⬆️
tests/extensions/test_timestamps.py	100.00% <100.00%> (ø)
tests/test_summaries.py	100.00% <100.00%> (ø)

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