Ruff import sorting

[ircwaves]

Related Issue(s):

• Closes Enable ruff's I rules #1119

Description:
Enables and applies Ruff's import sorting feature

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

Patch coverage: 100.00% and no project coverage change.

Comparison is base (7256486) 90.35% compared to head (151bc80) 90.35%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1132   +/-   ##
=======================================
  Coverage   90.35%   90.35%           
=======================================
  Files          48       48           
  Lines        6343     6343           
  Branches      944      944           
=======================================
  Hits         5731     5731           
  Misses        431      431           
  Partials      181      181           

Impacted Files	Coverage Δ
pystac/catalog.py	92.90% <100.00%> (ø)
pystac/extensions/raster.py	90.46% <100.00%> (ø)

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