A needlessly complicated and narratively underwhelming space adventure, “Lightyear” is not worthy of its titular action hero, Buzz Lightyear, who at this point is nearly as beloved in American pop culture as real life astronauts Neil Armstrong and Buzz Aldrin. It takes the “Toy Story” icon and sticks him in a meandering story that never hits the stars and struggles to even achieve liftoff. Audiences are used to infinity and beyond from the character, while “Lightyear” relegates him to the realms of second-tier Pixar. An introduction positions “Lightyear” as the movie that inspired the Buzz Lig…