fix(persistence): enable pragma foreign_keys

packages/stream_chat_persistence/lib/src/db/moor_chat_database.dart

@@ -64,6 +64,9 @@ class MoorChatDatabase extends _$MoorChatDatabase {
             }
           }
         },
+        beforeOpen: (details) async {
+          await customStatement('PRAGMA foreign_keys = ON;');
+        },
       );
 
   /// Deletes all the tables