rgw/cloudrestore: Add Restore support from Glacier/Tape cloud endpoints

rgw/cloudrestore: Add Restore support from Glacier/Tape cloud endpoints

Unlike regular S3 cloud services, restoring objects from S3/Tape or AWS Glacier services
would require special handling. We need to first restore the object using Glacier
RestoreObject API and then download it using GET.
https://docs.aws.amazon.com/cli/latest/reference/s3api/restore-object.html

This PR adds that support for "Expedited" tier retrieval type. That means the
restore would be quick and the object can be downloaded soon.

TODO: "Standard" tier-type support. Need to handle the case where in restore from
cloud endpoint could take a longer time and need to be monitored periodically
in the background.

Signed-off-by: Soumya Koduri <skoduri@redhat.com>