Add support for io2 volume types

[RobertLucian]

Description

As part of this ticket, checking that the provided volume type is available in the selected region (i.e. us-west-2) is also required.

More on io2 volume type here https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ebs-volume-types.html#EBSVolumeTypes_piops.