Alectinib Recruiting Phase 2 Trials for Stage IV Lung Cancer AJCC v8 / ALK Gene Rearrangement / ALK positive / Lung Non-Squamous Non-Small Cell Carcinoma / Stage IVA Lung Cancer AJCC v8 / Non-Squamous Non-Small Cell Lung Carcinoma / Stage IVB Lung Cancer AJCC v8 Screening