<i>Ab initio</i> exploration and prediction of AE-containing nitrido(litho/magneso)tetrelates (AE = Ca, Sr; Tt = Si, Ge) with [Si <sub>2</sub> N <sub>6</sub> ] <sup>10−</sup> or [Ge <sub>2</sub> N <sub>6</sub> ] <sup>10−</sup> units