feat: raise NotImplementedError for view_exists

Author: felixscherz

pyiceberg/catalog/s3tables.py

@@ -373,3 +373,6 @@ def drop_view(self, identifier: Union[str, Identifier]) -> None:
 
     def list_views(self, namespace: Union[str, Identifier]) -> List[Identifier]:
         raise NotImplementedError
+
+    def view_exists(self, identifier: Union[str, Identifier]) -> bool:
+        raise NotImplementedError