Add a way to choose columns in the `rustic snapshot` tabular output

[aawsome]

Discussed in #1657

^{Originally posted by s-leroux February 2, 2026}
Is there a way to choose columns in the rustic snapshot tabular output?

It is a special case, but while writing the docs, I often find myself piping the rustic snapshot output through cut to remove the Time column.

$ rustic snapshots | cut -d '|' -f 1,2, 4-


snapshots for (host [kasimir], label [], paths [Project])
| ID       | Host    | Label | Tags | Paths   | Files | Dirs |      Size |
|----------|---------|-------|------|---------|-------|------|-----------|
| 7f3eef1f | kasimir |       |      | Project |   507 |   87 | 524.0 KiB |
| 5109f5fe | kasimir |       |      | Project |   508 |   87 | 524.0 KiB |
| ca466029 | kasimir |       |      | Project |   509 |   87 | 524.0 KiB |
3 snapshot(s)