Burger chains are growing at a breakneck speed as some brands plan to open dozens or even hundreds of new restaurants this year. And in great news for fans smash burgers, Shake Shack has joined the list of fast-growing chains after previewing plans to expand aggressively in 2024. Shake Shack released its latest quarterly earnings results on May 2, reporting a 1.6% increase in same-store sales, a 12.3% increase ($443.3 million) in system-wide sal…