Support for LANZ mirroring

[dgonzalez85]

Enhancement summary

Trying to replicate AI configuration deployments where LANZ mirroring is enabled to mirror the buffered packets to the CPU.

queue-monitor length mirror
queue-monitor length mirror destination Cpu 

AVD currently does not support the mirror option:
https://avd.arista.com/5.1/roles/eos_cli_config_gen/docs/input-variables.html#queue-monitor-length

References:
https://www.arista.com/en/support/toi/eos-4-22-1f/14288-lanz-mirroring-2
https://www.arista.com/en/um-eos/eos-latency-analyzer-lanz
https://www.arista.com/en/um-eos/eos-latency-analyzer-lanz#xx1160486
https://www.arista.com/en/um-eos/eos-latency-analyzer-lanz#xx1160504

Note: this can be set to mirror to cpu or other ethernet interfaces.

Which component of AVD is impacted

eos_cli_config_gen

Use case example

Trying to replicate AI configuration deployments where LANZ mirroring is configured in some platforms.

Describe the solution you would like

Expand the queue-monitor configuration to support mirroring.

Describe alternatives you have considered

none

Additional context

No response

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