Define a User type with id: number, email: string and active: boolean.
Write isValidUser(data: unknown): boolean that returns true only when all three fields exist with the correct types and the email contains @.
Examples
isValidUser({ id: 1, email: "a@b.com", active: true }) → true
isValidUser({ id: "1", email: "a@b.com", active: true }) → false