Variable NOTIFICATION_POSITIONS`Const` `Experimental`

NOTIFICATION_POSITIONS: readonly [
    "top-left",
    "top-center",
    "top-right",
    "bottom-left",
    "bottom-center",
    "bottom-right",
]

The placements a notification can appear in, as a frozen array so it can be the single source of truth for both the NotificationPosition type and the notification service's OpenRPC position enum (which the service host spreads from this).