Search field - allow configurable default results

[mikerodonnell89]

Search field inputs (combobox, multi-input etc) automatically display a list of results when their popover bodies are opened, or on mobile screens when the fullscreen dialog is displayed. The design specs are unclear as to what exactly should be shown here - maybe a list of recent searches, or popular searches, or simply a list of possible selectable options/searches. So I think it would be good to allow the developer to provide a function to an input on any of these components where they can configure what exactly is shown to the user when these inputs are first expanded.