A Phase 3, Global Multi-Center, Double-Blind, Randomized, Efficacy Study of Zolbetuximab (IMAB362) Plus CAPOX Compared with Placebo Plus CAPOX as First-line Treatment of Subjects with Claudin (CLDN)18.2-Positive, HER2-Negative, Metastatic Gastric or Gastroesophageal Junction (GEJ) Adenocarcinoma