feat: create lib function to verify FCM token

src/controllers/token/index.spec.ts

@@ -174,7 +174,6 @@ describe("requests the /token route", () => {
   });
 
   it("token already exists in db, should not insert new entry", async () => {
-    const minimumTimestamp = DateTime.now();
     await db
       .insert(deviceTokensTable)
       .values({ deviceId: "123", token: "123" });