Add 'rank' and 'priority' fields to scopeDetails schema

**rank:** an ordinal rank -- an integer that represents the rank of the proposition compared to the other propositions in the response, placed within scopeDetails scope

**priority:** the actual priority value set at the admin/UI level, associated with each activity, placed within the activity scope

[Tech Spec: IDS Changes](https://wiki.corp.adobe.com/pages/viewpage.action?spaceKey=CJM&title=Tech+Spec%3A+Priority+Resolution+for+Inbound#TechSpec:PriorityResolutionforInbound-IDSChanges)

Read the linked Tech Spec: IDS Changes first, then locate the scopeDetails schema and its activity definition. Confirm that rank is an integer within scopeDetails and priority is placed within each activity. Done means both fields are represented in the schema with those scopes and descriptions.

Written by the indexing model from the issue text.