tor-hsservice: ipt-m: Add a TODO about code motion

As per
  https://gitlab.torproject.org/tpo/core/arti/-/merge_requests/1523#note_2934300

crates/tor-hsservice/src/ipt_mgr.rs

@@ -489,6 +489,8 @@ impl<R: Runtime, M: Mockable<R>> State<R, M> {
     }
 }
 
+// TODO HSS: Combine this block with the other impl IptManager<R, M>
+// We probably want to make sure this whole file is in a sensible order.
 impl<R: Runtime, M: Mockable<R>> IptManager<R, M> {
     /// Make some progress, if possible, and say when to wake up again
     ///