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/message.py

@@ -142,3 +142,5 @@ class Message(ComponentBase):
 
         self.set_output("content", content)
 
+    def thoughts(self) -> str:
+        return "Thinking ..."