Pier Sf

AWS::CloudFormation::StackSet does not allow setting Notifications SNS Topic ARNs for Stack Instances

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## 2. Scope of request Currently the newly released `AWS::CloudFormation::StackSet` resource does not allow setting Notifications SNS Topic ARNs for Stack Instances like the resource `AWS::CloudFormation::Stack` resource does for a...

### Describe your idea/feature/enhancement When using an `SNS` type of event source mapping for an `AWS::Serverless::Function` resource, one is able to specify an object to the `SqsSubscription` property. This enables...