To regionalize or not? That may be the question facing Rhode Island\u27s Bristol County. It is the smallest of the five counties in the state, with its 24.9 square miles equalling only 6 percent of Providence County, the state\u27s largest at 437 square miles. The three small towns of Barrington, Warren and Bristol that comprise this East Bay peninsula are usually given just a fleeting glance by visitors as they head south for Newport. Right now, the three towns are faced with a decision regarding the recycling of waste, which is to take place by September. The state Solid Waste Management Corp. provides an incentive of an additional 10 percent payment if cities and towns work together to handle this service