Add Catalog.fully_resolve

[gadomski]

Related Issue(s):

• Closes Add 'fully_resolve' back to STACObject #478

Description:

Pretty simple, we just use Catalog.walk.

Sidecar fixes:

• Tweak to the PR template to put the related items in a list by default -- this is how you need to format things to activate closing keywords
• Make the build status badge in the README a link

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

All modified and coverable lines are covered by tests ✅

Project coverage is 90.32%. Comparing base (f78637a) to head (a263672).
Report is 314 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1001   +/-   ##
=======================================
  Coverage   90.32%   90.32%           
=======================================
  Files          47       47           
  Lines        6180     6184    +4     
  Branches      927      929    +2     
=======================================
+ Hits         5582     5586    +4     
  Misses        420      420           
  Partials      178      178           

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