LibJS: Start implementing a Console class for the interpreter

The goal is to start factoring out core ConsoleObject functionality and
to make ConsoleObject only a JS wrapper around Console.

Libraries/LibJS/Interpreter.cpp

@@ -41,6 +41,7 @@ namespace JS {
 
 Interpreter::Interpreter()
     : m_heap(*this)
+    , m_console(*this)
 {
 }