Description of the new feature/enhancement

At the moment, a backgroundImage can be specified in a Windows Terminal profile. However, if I splitPane, the same background image is used in my duplicate pane. I would like the ability to specify an array of filesystem paths in the backgroundImage property, in my profile(s), and have Windows Terminal randomly select one from the array upon initialization.

Using a different background image for each pane helps to keep the interface lively and makes each pane more visually distinguishable from the others.

Proposed technical implementation details (optional)

Unsure