Add newline after `}` to separate from declarations

### Description

https://github.com/apple/swift-syntax/pull/1549#discussion_r1179899781
Test case `testSwitch2`

https://github.com/apple/swift-syntax/pull/1549#discussion_r1179900425
Test case `TrailingSemiTests`
It would be nice to also offer a newline as that is properly what the developer wants. 

### Steps to Reproduce

_No response_