code: def get_cloud_checksum(
              self,
              bucket: str,
              key: str
      ) -> str:
          
          response = self.get_all_metadata(bucket, key)
          return self.compute_cloud_checksum(response)
docs: Retrieves the cloud-provided checksum for a given object in a given bucket.
          :param bucket: the bucket the object resides in.
          :param key: the key of the object for which checksum is being retrieved.
          :return: the cloud-provided checksum