Give users the option to search existing Notification Contact Groups

In the "Contacts" pane, allow users to search through existing Notification Contact Groups. Additionally, give users the option to organize contact groups in some way, either by who created the group or by extending AF Categories to the contacts pane. Example: Notification Contact Groups can be configured to match how various engineers are organized into different teams throughout a company. However, another engineer using AF may unknowingly create duplicate notification contact groups, as they cannot easily find an existing contact group with the desired configuration. This leads to inconsistencies between notifications (different contact groups that reference the same list of engineers) and duplicated work (configuring the same contact groups multiple times)