Domain Map - Ability to add a new code

Feedback from services is that the domain map needs the ability to add a new row. As part of the mapping if the user identifies a code is not in the target, they will need to add it to the target GDB. They would not want to break out of the data translation mapping process, but have the ability to add a new row, where they would manually specify the target value in which they would add at a later date.

As an option, we could expose the ability to add the code to the target GDB also. This would call Add Code to domain.

@pLeBlanc93 @previnWong @ChrisBuscaglia