ShuffleByAlbum
When multiple albums are queued in the current playlist, shuffles them by entire album. If the player name is supplied, it will be used — otherwise its name will be assumed/elicited.
Invocation options (choose based on grammar-fit):
Alexa, [ open / start / launch ] MediaServer
Alexa, [ ask / tell ] MediaServer [ to / for ] …
{start} can be any of activate/enable/turn on/trigger.
{start} shuffle by album
{start} shuffle by album in {Player}
{start} shuffle by album on {Player}
{start} shuffle by album in the {Player}
{start} shuffle by album on the {Player}
{start} shuffle by album on {Player} player
{start} shuffle by album on the {Player} player