Cristiano Ronaldo. Naomi Campbell. Sofia Vergara. And the latest celebrity brought to Saudi Arabia in the kingdom's push to become a global entertainment destination: MrBeast, the most popular YouTuber on the planet.The online sensation hit 100 billion views this month and is in Riyadh to launch Beast Land, a theme park modeled on his videos that put people through elaborate endurance challenges to win large cash prizes."It's probably one of the best days of my life," the 27-year-old, whose