Fixes #721 (#282)

- Ensure minimum of 2 newlines after GO statement
- All existing unit tests are passing, indicating this is respecting scenarios where users have comment lines after GO statements (this happens in many other tests)

test/Microsoft.SqlTools.ServiceLayer.Test.Common/TestData/TSqlFormatter/TestFiles/Go.sql

@@ -0,0 +1,11 @@
+USE WideWorldImporters;
+GO
+ 
+ALTER DATABASE CURRENT COLLATE Latin1_General_100_CI_AS;
+GO
+ 
+ALTER DATABASE CURRENT SET RECOVERY SIMPLE;
+GO
+ 
+ALTER DATABASE CURRENT SET AUTO_UPDATE_STATISTICS_ASYNC ON;
+GO