[Proposal] Pattern matching using Select TypeOf

I suggest this syntax for pattern matching in select statements:
```
Select TypeOf t
Type x As String
Console.WriteLine(x.Length)
Type y As Integer
Console.WriteLine(y + 1)
Type Else
Console.WriteLine(t.ToString())
End Select
```

Edit:

Which can be lowered to:
```
Select Case t.GetType
Case GetType(String)
Dim x = CStr(t)
Console.WriteLine(x.Length)
Case GetType(Integer)
Dim y = CInt(t)
Console.WriteLine(y+ 1)
Case Else
Console.WriteLine(t.ToString())
End Select
```

Based on #542 , I suggest this:
```
Select CType(t)
Case x As String
Console.WriteLine(x.Length)
Case y As Integer
Console.WriteLine(y + 1)
Case Else
Console.WriteLine(t.ToString())
End Select
```