Return properties of the item with the given handle.

def item_properties(self, handle):
        """Return properties of the item with the given handle."""
        logger.debug("Getting properties for handle: {}".format(handle))
        properties = {
            'size_in_bytes': self.get_size_in_bytes(handle),
            'utc_timestamp': self.get_utc_timestamp(handle),
            'hash': self.get_hash(handle),
            'relpath': self.get_relpath(handle)
        }
        logger.debug("{} properties: {}".format(handle, properties))
        return properties