Acute Basilar Artery Stroke with Bilateral Vertebral Artery Occlusion Is Not Untreatable: Revascularization of the Vertebral Artery Through the Thyrocervical Trunk with a Transradial Snare-Assisted Technique and Stenting Followed by Basilar Trunk Stentriever Thrombectomy and Posterior Fossa Decompressive Craniectomy with an Unexpectedly Favorable Outcome