From CBS Sunday Morning: “Kitto Katto” is more than just the Japanese name for the candy we all know as Kit Kat. It’s more like Japan’s national obsession: At a shop in Tokyo’s bustling Ginza district, luxury Kit Kats are on full display. That’s right: luxury Kit Kats! And the mastermind behind these $5 Kit Kat confections is pastry chef Yasumasa Takagi. “In general,” chef Takagi says, “the Japanese prefer mild flavors, rather than aggressive flavors that hit you over the head.” Takagi has concocted Kit Kats with flavors like matcha green tea, butter, and strawberry maple. In Japan, “Kit Kat is very, very big,” said Cedric Lacroix, managing director…