Returns more than one additional image store

[l0rd]

Closes #2094

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[cgwalters]

On the commit message: this repository like many others in this organization uses "Linux kernel style" commit messages, see the git log - this blog is one I reference often.

In this case I'd say something like:

List all image stores in serialized state

The config format and internals support multiple stores, but the serialized state only returns one. Add a new field which lists all so that external callers can see all of them.

?

[rhatdan]

@l0rd still working on this one?

[l0rd]

@rhatdan yes. I mean I should resume working on this next week.

[l0rd]

When I first looked at https://github.com/containers/storage/issues/2094, I thought we had to address something in containers/storage. After looking at it again, I see that the problem is in container/podman, and there is nothing to fix here. I am closing this PR in favor of https://github.com/containers/podman/pull/24731