Merge pull request #1151 from writer/vlad/AB-510

chore: add feature flag for KV block

Author: UladzislauK-Writer

src/writer/blocks/writerkeyvaluestorage.py

@@ -55,6 +55,9 @@ def register(cls, type: str):
                             "style": "error",
                         },
                     },
+                    "featureFlags": [
+                        "keyvalue_storage",
+                    ],
                 },
             ),
         )