[FEATURE REQUEST] alias and the hosted zone ID to autogenerate certificate

[vponoikoait]

Related discussion: https://github.com/aws/copilot-cli/issues/5677 Currently there's a need to first input certificate, so that alias can be used with hosted zone in combination so that we can have a use of custom domain name - https://aws.github.io/copilot-cli/docs/developing/domain/ But desired here may be to have this behaviour without a need to actually hardcode certificate. Hosted zone & alias should be enough in order to generate certificate & it will simplify domain management much as well, as it will feel much more natural in such a manner to have it.