[MoveosStd] Implement shared and frozen Object

[jolestar]

Follow #1001

1. Add a flag field to ObjectEntity

struct ObjectEntity<T> {
      // The object id
      id: ObjectID,
      // The owner of the object
      owner: address,
      /// A flag to indicate whether the object is shared or frozen
      flag: u8,
      // The value of the object
      // The value must be the last field
      value: T,
}

2. Anyone can get &mut Object<T> from shared objects.
3. None one can get &mut Object<T> from frozen objects.