Cava is a growing restaurant chain with a long runway for growth ahead. Is buying it today a good way to build a seven-figure net worth?Cava Group (CAVA -2.80%) is often compared to Chipotle Mexican Grill. It's an apt comparison given the operating model of the two restaurant chains. But it also hints at the long-term opportunity for Cava if it can keep expanding its store base. Cava could be a key part of a millionaire-making portfolio, but it's still a stock you'll want to treat with a bit of caution.What ...