Ruff import sorting

[ircwaves]

Related Issue(s):

• Closes Enable ruff's I rules #515

Description:

Enable ruff import sorting, and add option to auto-fix.

PR Checklist:

• Code is formatted
• Tests pass
• Changes are added to the CHANGELOG

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (75ba746) 88.34% compared to head (04a9d1e) 88.34%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #518   +/-   ##
=======================================
  Coverage   88.34%   88.34%           
=======================================
  Files          13       13           
  Lines         987      987           
=======================================
  Hits          872      872           
  Misses        115      115           

Impacted Files	Coverage Δ
pystac_client/cli.py	69.56% <100.00%> (ø)
pystac_client/collection_client.py	84.61% <100.00%> (ø)
pystac_client/stac_api_io.py	90.99% <100.00%> (ø)
pystac_client/warnings.py	86.20% <100.00%> (ø)

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