WINTER PARK — This town is booming. After a slow recovery from the recession, development is in overdrive, with a new grocery store, affordable housing, performing arts stage and community center under construction downtown. Sales tax revenues are at record levels. Weekend events crowd shops and restaurants. Retired school buses that used to ferry visitors around the Fraser Valley have been replaced by sleek, new rigs. But the talk of the town is Dan Volpe and his plan to open a marijuana shop in the Valley Hi Motel.