status: Rework human readable output

[cgwalters]

• Add a circle like rpm-ostree
• Add a whitespace line between entries
• Drop not-present entries
• Rework timestamp+version combo; if there's no version, then show the column as Timestamp; if there's a version but no timestamp, just omit the timestamp
• Align columns

Closes: https://github.com/containers/bootc/issues/900

[tulilirockz]

Looks absolutely great!