new: add is_forward method to Message

aiogram/types/message.py

@@ -161,6 +161,15 @@ class Message(base.TelegramObject):
         """
         return self.text and self.text.startswith("/")
 
+    def is_forward(self):
+        """
+        Check message text is forward.
+        Only `forward_date` is required to be in forwarded message.
+
+        :return: bool
+        """
+        return bool(self.forward_date)
+
     def get_full_command(self):
         """
         Split command and args