Inspector: Show remote object properties in a table view

This patch expands the object model of this program quite a bit.
We now have a RemoteProcess object that contains a list of remote root
RemoteObject objects.

The RemoteProcess vends a RemoteObjectGraphModel&, and indices in that
model have internal_data() pointing to a corresponding RemoteObject.
RemoteObjects in turn vend a RemoteObjectPropertyModel&, which is what
we use to show the object properties.

This is pretty cool :^)

DevTools/Inspector/RemoteObject.h

@@ -0,0 +1,27 @@
+#pragma once
+
+#include <AK/AKString.h>
+#include <AK/JsonObject.h>
+#include <AK/NonnullOwnPtrVector.h>
+#include <AK/Vector.h>
+
+class RemoteObjectPropertyModel;
+
+class RemoteObject {
+public:
+    RemoteObject();
+
+    RemoteObjectPropertyModel& property_model();
+
+    RemoteObject* parent { nullptr };
+    NonnullOwnPtrVector<RemoteObject> children;
+
+    String address;
+    String parent_address;
+    String class_name;
+    String name;
+
+    JsonObject json;
+
+    NonnullRefPtr<RemoteObjectPropertyModel> m_property_model;
+};