The configuration for a custom domain that hosts the sign-up and sign-in webpages for your application.
Provide this parameter only if you want to use a custom domain for your user pool. Otherwise, you can exclude
this parameter and use the Amazon Cognito hosted domain instead.
For more information about the hosted domain and custom domains, see Configuring a User Pool Domain.
This is a convenience that creates an instance of the
CustomDomainConfigType.Builder avoiding the
need to create one manually via
CustomDomainConfigType#builder().
When the
Consumer completes,
CustomDomainConfigType.Builder#build() is called immediately and
its result is passed to
#customDomainConfig(CustomDomainConfigType).