Improve visualization of vpc-gw offers

[remyleone]

$ scw vpc-gw gateway-type list
Types.0.Name       VPC-GW-S
Types.0.Bandwidth  100000000
Types.0.Zone       fr-par-1
Types.1.Name       VPC-GW-M
Types.1.Bandwidth  1000000000
Types.1.Zone       fr-par-1