Oliver Smith 7973e45d16 [CORE] logger: add option to disable timestamps ...

Add an option to disable printing the timestamp. This is useful to not
have duplicate timestamps, when stderr is piped into a logging system
that adds timestamps on its own. For example with systemd's journald:

$ journalctl -u open5gs-smfd
Apr 10 13:25:18 hostname open5gs-smfd[1582]: 04/10 13:25:18.274: [app] INFO: Configuration: '/etc/open5gs/smf.yaml' (../lib/app/ogs-init.c:130)

Configuration change:
```
<OLD Format>
logger:
  file: /var/log/open5gs/smf.log

<NEW Format>
logger:
  file:
    path: /var/log/open5gs/smf.log
```

Example config, to have no timestamps on stderr:
```
logger:
  default:
    timestamp: false
  file:
    path: /var/log/open5gs/smf.log
    timestamp: true
```

2024-04-18 21:08:35 +09:00

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