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/RemoteProcess.h

@@ -0,0 +1,22 @@
+#pragma once
+
+#include <AK/NonnullOwnPtrVector.h>
+#include <LibCore/CLocalSocket.h>
+
+class RemoteObjectGraphModel;
+class RemoteObject;
+
+class RemoteProcess {
+public:
+    explicit RemoteProcess(pid_t);
+    void update();
+
+    RemoteObjectGraphModel& object_graph_model() { return *m_object_graph_model; }
+    const NonnullOwnPtrVector<RemoteObject>& roots() const { return m_roots; }
+
+private:
+    pid_t m_pid { -1 };
+    NonnullRefPtr<RemoteObjectGraphModel> m_object_graph_model;
+    CLocalSocket m_socket;
+    NonnullOwnPtrVector<RemoteObject> m_roots;
+};