A Randomized, Double-blind, Multi-center, Phase III Clinical Study of AK112 or Placebo Combined With Pemetrexed and Carboplatin in Patients With EGFR-mutant Locally Advanced or Metastatic Non-squamous Non-small Cell Lung Cancer Who Have Progressed on or Following Growth Factor Receptor Tyrosine Kinase Inhibitor (EGFR-TKI) Treatment (HARMONi)