Conductive 1D Metal–Organic Frameworks DDA‐X (DDA = Hexacoordinated 1,5‐Diamino‐4,8‐Dihydroxy‐9,10‐Anthraceneedione, X = Co, Ni, and Cu) for Highly Efficient Sulfur Redox Kinetics in Lithium–Sulfur Batteries: A Density‐Functional Theory Study