Feat: Add thought info to every component. (#9134)

### What problem does this PR solve?

#9082 #6365

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

agent/component/iterationitem.py

@@ -79,3 +79,5 @@ class IterationItem(ComponentBase, ABC):
     def end(self):
         return self._idx == -1
 
+    def thoughts(self) -> str:
+        return "Next turn..."