restic/changelog/unreleased/issue-3871

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Enhancement: Support `<snapshot>:<subfolder>` syntax to select subfolders
Commands like `diff` or `restore` always worked with the full snapshot. This
did not allow comparing only a specific subfolder or only restoring that folder
(`restore --include subfolder` limits the restored files, but still creates the
directories included in `subfolder`).
The commands `diff`, `dump`, `ls`, `restore` now support the
`<snapshot>:<subfolder>` syntax, where `snapshot` is the ID of a snapshot (or
the string `latest`) and `subfolder` is a path within the snapshot. The
commands will then only work with the specified path of the snapshot. The
`subfolder` must be a path to a folder as returned by `ls`.
`restic restore -t target latest:/some/path`
`restic diff 12345678:/some/path 90abcef:/some/path`
For debugging purposes, the `cat` command now supports `cat tree
<snapshot>:<subfolder>` to return the directory metadata for the given
subfolder.
https://github.com/restic/restic/issues/3871
https://github.com/restic/restic/pull/4334