At issue for many is whether the contractors should be considered employees—a debate that has surfaced in recent court decisions as more large employers rely on contract work.Last year, an appeals court ruled that FedEx Corp. incorrectly classified as contractors some delivery-truck drivers who were required to wear FedEx uniforms, drive company vehicles and groom themselves according to the company’s appearance standards.Similar lawsuits are facing firms like Uber, Lyft and Handy, which provides housecleaning and handyman services for as little as $25 an hour.