GAINESVILLE — A Messianic Jewish activist impersonating a Muslim who said he was concerned about Islamophobia met undercover over the last four weeks with Muslim professors at the University of Florida — including its new Teacher of the Year — in an apparent scheme to goad them into making remarks that would expose their bias against Israel and conservatives. The man turned out to be a stridently pro-Israel, Messianic Jewish hip hop rapper from Florida’s East Coast.