v18.0.0

• Re-introduce the tag command to update the tags of a stack without the need for synthesizing and re-deploying
• Support for legacy stacks created with aws-simple v10 or lower is discontinued
• Use Node.js 18 as Lambda runtime
• Introduce a new helper command cleanup to delete unused resources created by aws-simple
  • Currently, this command is used to find and delete REST-API CloudWatch roles that are no longer associated to a stack (see issue #169). In addition, the CDK is now required in version ^2.38.0.