Electronic and Chemical State of Aluminum from the Single- (K) and Double-Electron Excitation (KL<sub>II&III</sub>, KL<sub>I</sub>) X-ray Absorption Near-Edge Spectra of α-Alumina, Sodium Aluminate, Aqueous Al<sup>3+</sup>·(H<sub>2</sub>O)<sub>6</sub>, and Aqueous Al(OH)<sub>4</sub><sup>–</sup>