JERUSALEM — The number of Israeli settlers living in the West Bank has soared by nearly one-quarter in five years to over 420,000 people, a prominent settler leader said Sunday, presenting new population figures that he said put to rest the internationally backed idea of a two-state solution between Israel and the Palestinians. Yaakov Katz issued his report as the Israeli government is locked in negotiations with the Trump administration over understandings that are expected to include some curbs on settlement construction. “We are talking about a situation that is unchangeable,” he said Sunday.