I hope the API can add a metadata change listening interface

[m1509001]

希望 api 增加元数据变化监听接口，比如： 元数据添加 onPropertyValueAdd(callback) 元数据属性修改onPropertyNameChange(callback) 元数据值修改onPropertyValueChange(callback) 元数据删除onPropertyValueRemove(callback)

I hope the API can add a metadata change listening interface, such as: adding metadata onPropertyAdd (callback) modifying metadata onPropertyValueChange (callback) modifying metadata onPropertyNameChange (callback) deleting metadata onPropertyRemove (callback)