Manages toast notifications within the editor. This object manages the functionality and display of toast notifications within the editor, ensuring timely and informative alerts are presented to users. [b]Note:[/b] This class shouldn't be instantiated directly. Instead, access the singleton using [method EditorInterface.get_editor_toaster]. Pushes a toast notification to the editor for display. Toast will display with an INFO severity. Toast will display with a WARNING severity and have a corresponding color. Toast will display with an ERROR severity and have a corresponding color.