Function addWatcher

addWatcher(
listener: (event: string, port: { name: string; path: string }) => void,
): void
Register a listener for serial port connection and disconnection events. The listener is called with two arguments: the event type string ("added" or "removed") and a port-info object with name and path fields.
Parameters
- listener: (event: string, port: { name: string; path: string }) => void
  The function to call when a serial port is added or removed
Returns void