engine: Create a resource kind+name specific stateful store

This adds a meta state store that is preserved between graph switches if
the kind and name match. This is useful so that rapid graph changes
don't necessarily reset their retry count if they've only changed one
resource field.

engine/graph/actions.go

@@ -256,6 +256,11 @@ func (obj *Engine) Worker(vertex pgraph.Vertex) error {
 		return fmt.Errorf("permanently limited (rate != Inf, burst = 0)")
 	}
 
+	// initialize or reinitialize the meta state for this resource uid
+	if _, exists := obj.metas[engine.PtrUID(res)]; !exists || res.MetaParams().Reset {
+		obj.metas[engine.PtrUID(res)] = &engine.MetaState{}
+	}
+
 	//defer close(obj.state[vertex].stopped) // done signal
 
 	obj.state[vertex].cuid = obj.Converger.Register()