A Phase IIIb, Randomized, Multicenter, Open-label Study to assess the Efficacy of Durvalumab plus Tremelimumab versus Pembrolizumab in Combination with Platinum-Based Chemotherapy for First-Line Treatment in Metastatic Non-Small Cell Lung Cancer Patients with Non-Squamous Histology who have Mutations and/or Co-mutations in STK11, KEAP1, or KRAS (TRITON)