Midtown’s tallest-ever skyscraper, to be anchored by Ken Griffin’s financial companies, has gotten the green light in a 48-0 vote by the City Council — a rare unanimous endorsement by the often development-averse body.The plan for a new 350 Park Ave. represents a remarkable personal commitment by mega-billionaire Griffin, who’s a partner with two major development companies — privately held Rudin and publicly traded Vornado Realty Trust.The 1,600-foot-tall tower will dwarf Midtown’s current cloudbuster king ...