Add "Initiative Rank" field as a reporting data object

With the enhancement of being able to change the sequence in which initiatives are displayed in the Strategy -> Initiative page, there is the opportunity to force rank/prioritize initiatives based on their sort order. Just as the sort order of Features on the Feature Board for a given release dynamically populate a reporting data object called "Feature Rank", there should be a similar field provided for Initiatives that dynamically represents the "Initiative Rank".