Find out what the Mets are getting in Kodai Senga, according to a National League talent evaluator. The Mets dished out a five-year, $75 million deal to Japanese phenom, Kodai Senga, in December, slating him in as the No. 3 starter in their rotation for this upcoming season. So what are they getting in the soon-to-be 30-year-old hard-throwing righty? “He’s a guy, who just continues to get better,” said one National League talent evaluator, who scouted Senga in the Nippon Professional Baseball League. “He has a history of winning over there. It’s a good makeup guy. He was not a…