Ottawa’s annual competition has acquired some characteristics all its own. In one way it’s a classic David versus Goliath event as established competitors with deep pockets are challenged by young chefs eager to show off their skills.   But only in Ottawa do chefs go to extreme lengths to capture attention by designing their competition tables with videos, sculptures, and custom bars.    This year, will this extra effort gain those chefs the edge to land a gold, or will the proof be solely on the plate?