NEW YORK — Tonya Pinkins is not a fan of revivals. The Tony Award-winning star of Broadway musicals such as “Jelly’s Last Jam” and “Caroline, or Change” is known for publicly denouncing the idea of acting in shows that have already been done before. But she eagerly signed on to co-star in The Public Theater’s revival of Lorraine Hansberry’s classic play “A Raisin in the Sun” after director Robert O’Hara said her character ― Lena Younger, the stoic matriarch of a struggling Chicago family — would anchor the new production. “Robert told me what he wanted to do, and that we were not doing another…