역할(role) 콘트롤러 추가

src/controllers/index.ts

-export * as userCtrl from "./user.controller";
 export * as authCtrl from "./auth.controller";
+export * as roleCtrl from "./role.controller";
+export * as userCtrl from "./user.controller";

src/controllers/role.controller.ts

+import { roleDb } from "../db";
+import { asyncWrap } from "../helpers";
+
+export const getRoles = asyncWrap(async (req, res, next) => {
+  const roles = await roleDb.getAllRoles();
+  return res.json(roles);
+});