Finalizing a form that creates an entity should add to the debug log

[seadowg]

Forms that create entities have an in progress spec here.

Each log line should contain the following info: project id, form id, instance id, entity type, entity id, entity attributes. This lets us verify that Collect can parse entity forms.

Notes

It might be a good idea to wrap the logging behind a repository. This, in theory, would mean that to actually start story entities we'd only to change the implementation of the repository rather than what happens at form finalization.