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).

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.09%. Comparing base (8daf543) to head (a217850).
Report is 6 commits behind head on gz-gui8.

❗ Current head a217850 differs from pull request most recent head 8239028. Consider uploading reports for the commit 8239028 to get more accurate results

Additional details and impacted files

@@           Coverage Diff            @@
##           gz-gui8     #613   +/-   ##
========================================
  Coverage    70.09%   70.09%           
========================================
  Files           39       39           
  Lines         5363     5363           
========================================
  Hits          3759     3759           
  Misses        1604     1604           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.