[Enhancement][Cli] Add a command to see the tracked veth

[LorenzoTettamanti]

Is your feature request related to a problem?

• Yes

  Problem Description:

Right now the only way to see the monitored veth interfaces is to check the identity logs and find when the register_netdevice kprobe and the unregister_netdevice_queue kprobe are triggered.

Solution:

Add a command in the monitoring section that returns the monitored veth interfaces. The command can be like
cfcli monitor veth or cfcli monitor veth-interfaces

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