WASHINGTON — The FBI searched Donald Trump’s Mar-a-Lago estate as part of an investigation into whether he took classified records from the White House to his Florida residence, people familiar with the matter said Monday.It’s a move that represents a dramatic and unprecedented escalation of law enforcement scrutiny of the former president.Trump, disclosing the search in a lengthy statement, asserted that agents had opened up a safe at his home and described their work as an “unannounced raid” …