chore: add todo for _attribute_to_access

Author: shihab-dls

src/fastcs/transport/epics/pva/pvi.py

@@ -15,6 +15,7 @@
 AccessModeType = Literal["r", "w", "rw", "d", "x"]
 
 
+# TODO: This should be removed after https://github.com/DiamondLightSource/FastCS/issues/260
 def _attribute_to_access(attribute: Attribute) -> AccessModeType:
     match attribute:
         case AttrRW():