Allow users to copy existing surveys

[gino-m]

This would copy survey settings and tasks but not LOIs/sites

[jabramowitz5]

@rfontanarosa was able to do a backend clone for me on a survey a few months back so it may be that the functionality is ready to go and just needs to be tied into a UI / button somehow for survey organizer to do this themselves? @gino-m

[gino-m]

@jabramowitz5 I believe that was a quick sol'n implemented on the backend for use by @rfontanarosa only. If we're exposing this feature to the user, I would recommend 1) defining the user-facing interface and 2) implementing this accordingly, likely on the client.