Function once

once(
    element: HSAXElement,
    notification: string | string[],
    listener: (notification: string, element: HSAXElement) => void,
): void
Register a listener that fires at most once for AX events on a specific element
Parameters
- element: HSAXElement
  An HSAXElement to watch - see on for the application-vs-descendant bubbling behavior
- notification: string | string[]
  An event name, or an array of event names, to watch for with the same listener
- listener: (notification: string, element: HSAXElement) => void
  Called once (per registered notification name), then automatically removed
Returns void