Function signUp

signUp(input): Promise<SignUpOutput>
Creates a user
Parameters
- input: SignUpInput
  The SignUpInput object
Returns Promise<SignUpOutput>
SignUpOutput

Throws
service: SignUpException - Cognito service errors thrown during the sign-up process.

Throws
validation: AuthValidationErrorCode - Validation errors thrown either username or password are not defined.

Throws
AuthTokenConfigException - Thrown when the token provider config is invalid.