feat(message.py): move CONTROL-specific methods into Message.Control inner class

src/judas_protocol/message.py

@@ -52,6 +52,63 @@ class Message:
             f", ack_required={self.ack_required})"
         )
 
+    class Control:
+        """CONTROL category message factory methods."""
+
+        @staticmethod
+        def ack(target_id: str) -> Message:
+            """Create an ACK message.
+
+            Args:
+                target_id (str): The ID of the message to acknowledge.
+
+            Returns:
+                Message: The created ACK message.
+            """
+            return Message(
+                id_=None,
+                category=Category.CONTROL,
+                action=ControlAction.ACK,
+                payload={"target_id": target_id},
+                acknowledged=False,
+                ack_required=False,
+            )
+
+        @staticmethod
+        def hello(id_: str) -> Message:
+            """Create a HELLO message.
+
+            Args:
+                id_ (str): The ID to include in the HELLO message.
+            Returns:
+                Message: The created HELLO message.
+            """
+            return Message(
+                id_=None,
+                category=Category.CONTROL,
+                action=ControlAction.HELLO,
+                payload={"id": id_},
+                acknowledged=False,
+                ack_required=True,
+            )
+
+        @staticmethod
+        def close() -> Message:
+            """Create a CLOSE message.
+            Prompts the recipient to close the connection and not reconnect.
+
+            Returns:
+                Message: The created CLOSE message.
+            """
+            return Message(
+                id_=None,
+                category=Category.CONTROL,
+                action=ControlAction.CLOSE,
+                payload={},
+                acknowledged=False,
+                ack_required=True,
+            )
+
     def to_dict(self) -> dict[str, Any]:
         """Convert the message to a dictionary.
 
@@ -144,57 +201,3 @@ class Message:
             Message: The created message.
         """
         return cls.from_json(data.decode("utf-8"))
-
-    @classmethod
-    def ack(cls, target_id: str) -> Message:
-        """Create an ACK message.
-
-        Args:
-            target_id (str): The ID of the message to acknowledge.
-
-        Returns:
-            Message: The created ACK message.
-        """
-        return cls(
-            id_=None,
-            category=Category.CONTROL,
-            action=ControlAction.ACK,
-            payload={"target_id": target_id},
-            acknowledged=False,
-            ack_required=False,
-        )
-
-    @classmethod
-    def hello(cls, id_: str) -> Message:
-        """Create a HELLO message.
-
-        Args:
-            id_ (str): The ID to include in the HELLO message.
-        Returns:
-            Message: The created HELLO message.
-        """
-        return cls(
-            id_=None,
-            category=Category.CONTROL,
-            action=ControlAction.HELLO,
-            payload={"id": id_},
-            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,
-        )