Bukayo Saka has agreed a new five-year contract with Arsenal that will make him one of the highest-paid players in the club’s history. The deal, expected to run until 2031, is understood to be worth more than £15m a season, reflecting Saka’s importance to the team. Arsenal’s sporting director Andrea Berta made securing the Hale End graduate a priority after tying down several other young stars. Saka, who joined the club aged seven, had previously said he…