Mr. Mayhew — who was 7-foot-3 — donned a shaggy costume to play Chewbacca, the menacing yet cuddly Wookiee who was a sidekick to Han Solo and the co-pilot of the Millennium Falcon. He appeared in all three films of the original trilogy, as well as in “Revenge of the Sith” in 2005 and “The…