Caesars Entertainment proposed Boston casino would draw elite international gamblers in the same way Las Vegas does, and marks one of the U.S. gaming industry’s best cash-making opportunities, CEO Gary Loveman said on Friday. The company, which is pursuing an aggressive expansion agenda in the United States while wrestling with a mountainous debt burden of over $20 billion, is among a handful of major casino operators vying for licenses in Massachusetts. The State Gaming Commission expects to begin awarding the three available licenses by April 2014. “We think Boston is one of the best opportunities in the United States,” Loveman…