feat(message.py): add CLOSE msg constructor

src/judas_protocol/message.py

@@ -181,3 +181,20 @@ class Message:
             acknowledged=False,
             ack_required=True,
         )
+
+    @classmethod
+    def close(cls) -> Message:
+        """Create a CLOSE message.
+        Prompts the recipient to close the connection and not reconnect.
+
+        Returns:
+            Message: The created CLOSE message.
+        """
+        return cls(
+            id_=None,
+            category=Category.CONTROL,
+            action=ControlAction.CLOSE,
+            payload={},
+            acknowledged=False,
+            ack_required=True,
+        )

src/judas_protocol/types.py

@@ -13,3 +13,4 @@ class Category(str, Enum):
 class ControlAction(str, Enum):
     HELLO = "hello"
     ACK = "ack"
+    CLOSE = "close"