SpaceX, Elon Musk’s rocket maker and artificial intelligence company, set a price for its initial public offering on Wednesday of $135, which would value it at $1.77 trillion and crown it the largest I.P.O. ever. 埃隆·马斯克的火箭制造与人工智能公司——美国太空探索技术公司(SpaceX)周三将…