Add the `proxmox_log` crate which includes the new logging infra.
Export the `init_logger` function, which creates the `tracing` logger
that includes the default subscriber and two layer.
The first layer comes from the tracing-journald crate and logs
everything that does not come from a worker-task/thread to the syslog.
The second layer filters the exact opposite and writes the logs into the
corresponding task-log file.
Reviewed-by: Lukas Wagner <l.wagner@proxmox.com>
Tested-by: Lukas Wagner <l.wagner@proxmox.com>
Signed-off-by: Gabriel Goller <g.goller@proxmox.com>
