Add parsed_column_name property to PydanticTimeSpineCustomGranularity…

…Column

dbt_semantic_interfaces/implementations/time_spine.py

@@ -35,6 +35,11 @@ def _implements_protocol(self) -> TimeSpineCustomGranularityColumn:
     name: str
     column_name: Optional[str] = None
 
+    @property
+    def parsed_column_name(self) -> str:
+        """Get column name. Assumed `name` attribute unless `column_name` is set."""
+        return self.column_name or self.name
+
 
 class PydanticTimeSpine(HashableBaseModel, ProtocolHint[TimeSpine]):  # noqa: D101
     @override