Fix ament packaging

[artivis]

Several packages provided by eProsima offer the possibility to be built with colcon. However said packages do not install their package.xml file nor do they populate the ament index.
This PR add two macros to cmake_utils to do just that. Plus they are invoked from the eprosima_packaging macro when a build with ament is detected.

Note that of course packages that aren't using this macro will not benefit from this quick fix, e.g. fastdds.

Related to ros-infrastructure/rosdep#724

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 71.51%. Comparing base (932abda) to head (08a9144).
⚠️ Report is 99 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #34      +/-   ##
==========================================
+ Coverage   71.18%   71.51%   +0.32%     
==========================================
  Files          49       50       +1     
  Lines         819      853      +34     
  Branches      187      202      +15     
==========================================
+ Hits          583      610      +27     
  Misses        134      134              
- Partials      102      109       +7     

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