Handle block comments before a GO

[SqlQuantumLeap]

Batch parsing should be able to handle the following cases:

1. single, single-line block comment:

   /* comment */  GO
   

2. single, multiple-line block comment:

   /* comment line 1
        line 2
         line 3        */  GO
   

3. multiple block comments (no space between them!):

   /* comment line 1
        line 2 *//* start of #2 
                */            GO 4
   

4. batch terminator embedded in a multi-line comment should be ignored:

   /* comment line 1
   GO
    more comments */
   

5. batch terminator embedded in a multi-line string literal should be ignored:

   ' some text
   GO
    more text'