Add a display "Filtering" capability to the Contributor Block, similar to the way filtering is implements for Events.

The use case here is when a church has numerous Contributors displayed on their website, and they want the default display to show all contributors alphabetically. Adding a "Filtering" capability would then allow a site's user to decide what group (Category) they want to display. For example, Pastoral Staff, Administration, Elders or Governance Board, etc.

Below is an associated request.