method Checkbox.prototype.getCheckboxIconimport { Checkbox } from "https://dotland.deno.dev/x/cliffy@v1.0.0-rc.4/prompt/mod.ts"; getCheckboxIcon(option: CheckboxOptionSettings<TValue> | CheckboxOptionGroupSettings<TValue>): stringParametersoption: CheckboxOptionSettings<TValue> | CheckboxOptionGroupSettings<TValue>Returnsstring