Add read_only param for __init__

Author: kylebarron

src/zarr/storage/object_store.py

@@ -40,9 +40,11 @@ def __eq__(self, value: object) -> bool:
 
         return self.store.__eq__(value.store)
 
-    def __init__(self, store: _ObjectStore) -> None:
+    def __init__(self, store: _ObjectStore, *, read_only: bool = False) -> None:
         self.store = store
 
+        super().__init__(read_only=read_only)
+
     def __str__(self) -> str:
         return f"object://{self.store}"