Command to Assign Model(s) to an AnalysisProject

It has been requested that a command be created to manually attach a model to an analysis project.

For consolation the creation of the bridge entity triggers a Timeline::Event so it is possible to determine later that the model was not actually a creation of that analysis project.
This might be too lenient in that it might accidentally match.  We can probably wait until it's a problem before worrying about it unless there's an easy way to improve it.