Add package.xml

[azeey]

🎉 New feature

Summary

Add package.xml based on dependencies found in .github/ci/packages.

This is to test out using vendor packages to provide Gazebo packages to ROS users (see gazebo-tooling/release-tools#1117).

Test it

Checklist

• Signed all commits for DCO
• Added tests
• Added example and/or tutorial
• Updated documentation (as needed)
• Updated migration guide (as needed)
• Consider updating Python bindings (if the library has them)
• codecheck passed (See contributing)
• All tests passed (See test coverage)
• While waiting for a review on your PR, please help review another open pull request to support the maintainers

Note to maintainers: Remember to use Squash-Merge and edit the commit message to match the pull request summary while retaining Signed-off-by messages.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.98%. Comparing base (f928192) to head (cfc237c).

❗ Current head cfc237c differs from pull request most recent head 2d33fac. Consider uploading reports for the commit 2d33fac to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           gz-utils2     #125   +/-   ##
==========================================
  Coverage      80.98%   80.98%           
==========================================
  Files              8        8           
  Lines            384      384           
==========================================
  Hits             311      311           
  Misses            73       73           

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[mjcarroll]

Not a blocker here, but maybe eventually worth adding a key for CLI11 (libcli11-dev) and adding a depend here, since we are currently vendoring, but could probably drop that.