Canal Street used to sell knockoff dreams from folding tables — now it’s hawking $150 tees and handmade tailoring.  William Zimmerman dives into the unlikely rise of a high-end menswear enclave on one of New York’s grittiest strips.  From counterfeit capital to fashion frontier, something big is brewing between the Holland Tunnel and the curbside chaos.  Is Canal Street getting polished — or just sharpening its edge?