getTemplateSummary  
  inline suspend fun CloudFormationClient.getTemplateSummary(crossinline block: GetTemplateSummaryRequest.Builder.() -> Unit): GetTemplateSummaryResponse
Returns information about a new or existing template. The GetTemplateSummary action is useful for viewing parameter information, such as default parameter values and parameter types, before you create or update a stack or StackSet.
You can use the GetTemplateSummary action when you submit a template, or you can get template information for a StackSet, or a running or deleted stack.
For deleted stacks, GetTemplateSummary returns the template information for up to 90 days after the stack has been deleted. If the template doesn't exist, a ValidationError is returned.