NEW YORK — Disney will sprinkle its pixie dust on the streaming arena Tuesday, as its Disney Plus service debuts with an arsenal of marquee franchises including Marvel and Star Wars, original series with a built-in fan base and a cheap price to boot. The $7-a-month commercial-free service is poised to set the standard for other services like WarnerMedia’s HBO Max and NBCUniversal’s Peacock to follow, as major media companies behind hit TV shows and movies seek to siphon the subscription revenue now going to Netflix and other streaming giants. Disney’s properties speak to its strengths.