PROVIDENCE — One executive chef, one sous chef, four line cooks, four prep cooks, two dishwashers, four hosts, six servers and a slew of counter staff. These are just a handful of the 30 employees Kim Anderson needs to fully staff Plant City in Providence. Anderson is so desperate to hire trained staff that she is offering a $250 gift certificate to anyone who recommends someone she can hire. And she is placing a note on every place setting with a list of unfilled jobs and a line that says,” Do you know someone interested in joining our team?” The second pandemic: That’s what some restaurant owners are calling the dearth of restaurant workers this spring.