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 98.26%. Comparing base (23c28a2) to head (e0eaf66).
Report is 1 commits behind head on gz-plugin2.

❗ Current head e0eaf66 differs from pull request most recent head 9cdbaeb. Consider uploading reports for the commit 9cdbaeb to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##           gz-plugin2     #139   +/-   ##
===========================================
  Coverage       98.26%   98.26%           
===========================================
  Files              23       23           
  Lines             748      748           
===========================================
  Hits              735      735           
  Misses             13       13           

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