WASHINGTON — A Florida Republican is demanding a federal probe into Puerto Rican rapper Bad Bunny’s “dangerous” and “offensive” Super Bowl halftime show performance over the weekend, The Post has learned. Rep. Randy Fine accused the rapper of encouraging children to use cocaine and faulted him for dropping F-bombs in Spanish, while calling the Federal Communications Commission (FCC) to investigate how NBC Universal and the NFL allowed that “indecent material to be broadcast.” “What Americans