By Kevin Gray If locals had to guess which Dallas bar would open a swim club, complete with cabanas and cocktails, they would have made their way down a very long list before settling on Lee Harvey’s. The longtime institution, known for its lovably divey atmosphere, patio picnic tables and canned Lone Star, isn’t the type of place you’d typically associate with swimming. Huddling around a fire pit with your beer and a burger, yes. Swimming? No. So when Lee Harvey’s teased its plans for an offshoot called Lee Harvey’s Dive In last year, there was a mixture of excitement and confusion. Permittin…