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journalctl: add new varlink read service to get entries We already have some varlink support for the journal to perform some actions like `Rotate`. It would be nice to be able to query the journal via varlink too so this commit adds a new varlinkctl based journal service that exposes a single GetEntries() call to retrieve journal entries. Basic filtering is supported and we can expand the API as needed. This is a separate `io.systemd.JournalControl` [1] service from the existing `io.systemd.Journald` to decouple read and write (thanks to Lennart for suggesting this). This also extracts some shared helper so that we do not duplicate code when generating the json or when adding the filters. [1] The name mirrors the bootctl->io.systemd.BootControl naming.