The line between public and private school is getting awfully thin in Pittsburgh.   City public school directors received a request from Imani Christian Academy, a religious school in the East Hills, to be allowed to transform into Imani Academy Charter School for the Fall term of 2019.   Though parochial schools have metamorphosed into charter schools in Florida, Tennessee and Washington, D.C., this would be the first such transformation in Pennsylvania, according to Ana Meyers, executive director of…