authenticate method
Requests biometric authentication using the Flutter Local Authentication plugin.
This method triggers a biometric authentication prompt, allowing the user to
authenticate using their fingerprint, face, or other biometric methods
supported by the device. If the user successfully authenticates, the method
returns true. If authentication fails or is canceled, it returns false.
Implementation
Future<bool> authenticate() {
throw UnimplementedError('authenticate() has not been implemented.');
}