Add new method enable_sync() in _Entity

Author: Shubham

objectbox/model/entity.py

@@ -274,6 +274,10 @@ def _unmarshal(self, data: bytes):
             setattr(obj, prop.name, val)
         return obj
 
+    def enable_sync(self):
+        # Set SYNC_ENABLED flag for this entity
+        self._flags |= OBXEntityFlags.SYNC_ENABLED
+
 # Dictionary of entity types (metadata) collected by the Entity decorator.
 # Note: using a list not a set to keep the order of entities as they were defined (set would not be deterministic).
 obx_models_by_name: Dict[str, List[_Entity]] = {}
@@ -325,5 +329,5 @@ def wrapper(class_) -> Callable[[Type], _Entity]:
 
 def SyncEntity(cls):
     entity: _Entity = obx_models_by_name["default"][-1]  # get the last added entity
-    entity._flags |= OBXEntityFlags.SYNC_ENABLED
+    entity.enable_sync()
     return cls