feat: Add `domain_name` output#48

bryantbiggs merged 5 commits intoterraform-aws-modules:masterterraform-aws-modules/terraform-aws-opensearch:masterfrom

RoseSecurity:update-default-tls-policy-and-add-domain-name-outputRoseSecurity/terraform-aws-opensearch:update-default-tls-policy-and-add-domain-name-outputCopy head branch name to clipboard