Use ConsoleReadLine for script debugger

Instead of Console.ReadLine() so that arrow keys and tab-completion can
be used.

src/Microsoft.PowerShell.Linux.Host/main.cs

@@ -524,7 +524,7 @@ OPTIONS
             while (resumeAction == null)
             {
                 Console.Write("[DBG] PS >> ");
-                string command = Console.ReadLine();
+                string command = consoleReadLine.Read(this.myHost.Runspace); 
                 Console.WriteLine();
 
                 // Stream output from command processing to console.