Fix certain component IDs not being able to be settable afterwards

Fix #10305

discord/ui/separator.py

@@ -83,6 +83,15 @@ class Separator(Item[V]):
     def _is_v2(self):
         return True
 
+    @property
+    def id(self) -> Optional[int]:
+        """Optional[:class:`int`]: The ID of this separator."""
+        return self._underlying.id
+
+    @id.setter
+    def id(self, value: Optional[int]) -> None:
+        self._underlying.id = value
+
     @property
     def visible(self) -> bool:
         """:class:`bool`: Whether this separator is visible.