Changes to Get a snapshot

added the non-success response with the status 422

added the optional property snapshot/v0 to the response with the 200 status

added the optional property snapshot/architecture to the response with the 200 status

added the optional property snapshot/regions to the response with the 200 status

added the pattern ^(?:snap_[A-Za-z0-9]{28}|vhs_[a-z0-9]{28})$ to the path request parameter snapshotId

for the path request parameter snapshotId, the maxLength was set to 33

the response property snapshot/region became optional for the status 200

added the non-success response with the status 410

endpoint added