feat: add ApplicationContext.attachment_size_limit property

Signed-off-by: hich4t <[email protected]>

Author: hich4t

discord/commands/context.py

@@ -268,6 +268,13 @@ def unselected_options(self) -> list[Option] | None:
                 return self.command.options  # type: ignore
         return None
 
+    @cached_property
+    def attachment_size_limit(self) -> int | None:
+        """Returns the attachment size limit associated with this context's command.
+        Shorthand for :attr:`.Interaction.attachment_size_limit`.
+        """
+        return self.interaction.attachment_size_limit
+
     @property
     @discord.utils.copy_doc(InteractionResponse.send_modal)
     def send_modal(self) -> Callable[..., Awaitable[Interaction]]: