Ability to query the snap store cross-architecture

[pedronis]

we already had something in the backlog about this:

Show other architectures with snap info

In my quest to use the cli to release revisions of my snaps to stable, I found it quite difficult to script discovering the revision for each architecture in a specific channel in order to promote to another channel. For example: snapcraft release <snap-name> <revision> <channel> To query the revision of a snap in the edge channel, I was able to script `snap info ’ and parse the output to get the revision in edge. However, this only finds the revision for my current architecture. It would b…