“Hi, I am Kodai Senga of the New York Mets,” said the Mets’ newest hurler, introducing himself to the Major Leagues on Monday at Citi Field. “I am very happy and excited to be in the Big Apple and to join such a great team.” It was a moment long in the making. General manager Billy Eppler had an eye for nearly a decade, going back to his days as a Pacific Rim scout who famously aided in the signing of Masahiro Tanaka with the Yankees and Shohei Ohtani with the Los Angeles Angels. Eppler first came across the right-hander in 2013, three years after he was taken by Fukuoka SoftBank Hawks in the …