Theoretical Study of Au(I)–Ag(I) Metallophilic Attractions and Luminescence of [Au2(carb)2Ag(μ-3,5-Ph2pz)] (With Ph=phenyl, Pz=pyrazolate) and [Au(im)CH3(pz)Ag2(μ-3,5-H2pz)2] (With Im=imidazole) Complexes