The rich could be even richer — if they stop leaving money on the table. The people owed a portion of the $20 billion in “unclaimed funds” from the New York comptroller’s office include a Who’s Who of political, business and entertainment figures — from President Trump and first lady Melania to lefty city Rep. Alexandria Ocasio-Cortez, billionaires Jeff Bezos and Mike Bloomberg and music stars Jay-Z and Lady Gaga. A claimant named Barack Obama is also owed money. Even Gov. Kathy Hochul is