Add a template model with basic utilities already included into model class

This MR adds the CopyMeEssentials template model, which provides what I regard as essential in a model template, including the integration of the ActionManager and the DataManager from Utopia::Utils.

Can this MR be accepted?

• Implementation ready

• Tests added or adjusted

• Documentation extended or updated

• Code quality

  • Changes follow coding guidelines
  • Checked code coverage on new and adjusted code

• Ready for merging

  • Pipeline passes without warnings
  • History cleaned-up or squash option set

Related issues

Closes #3 (closed)