A Phase 3, Multicenter, Randomized, Open-label Study Evaluating Efficacy of Sotorasib Platinum Doublet Combination versus Pembrolizumab Platinum Doublet Combination as a Front-Line Therapy in Subjects with Stage IV or Advanced Stage IIIB/C Nonsquamous Non- Small Cell Lung Cancers, Negative for PD-L1, and Positive for KRAS p.G12C (CodeBreak 202)