feat: add Object.same static method for reliable built-in equality

Introduce a new static method `Object.same(obj1, obj2)` that exposes the VM's
built-in equality semantics (`wrenValuesEqual`) directly, bypassing any
user-defined `==` overrides. This required creating a dedicated metaclass for
Object (subclass of Class) to host the static method without polluting every
class with a `same` method. The implementation wires up a new `Object metaclass`
in the core initialization sequence, adjusts the class hierarchy setup order,
and adds comprehensive tests covering value types, identity comparison, and
verification that `Object.same` ignores custom `==` operators.

test/core/class/name.wren

@@ -5,5 +5,9 @@ IO.print(Foo.type.name) // expect: Foo metaclass
 
 // Make sure the built-in classes have proper names too.
 IO.print(Object.name) // expect: Object
-IO.print(Class.name) // expect: Class
 IO.print(Bool.name) // expect: Bool
+IO.print(Class.name) // expect: Class
+
+// And metaclass names.
+IO.print(Object.type.name) // expect: Object metaclass
+IO.print(Bool.type.name) // expect: Bool metaclass