PITTSBURGH — The Pittsburgh Pirates and All-Star pitcher Mitch Keller agreed to a five-year contract worth $77 million, a person with knowledge of the agreement told The Associated Press on Thursday. Pittsburgh signed Gold Glove third baseman Ke’Bryan Hayes to a $70 million, eight-year deal before the 2022 season and inked c enterfielder Bryan Reynolds to a $106.75 million, eight-year …