Feature: Add support for Postcard telemetry

[chetryan]

Enhancement summary

At the moment, if we want to use Postcard telemetry, we need to add the eos_cli commands. Ideally this would be supported in the eos_cli_config_gen data model.

Documentation about the EOS feature can be found here : https://www.arista.com/en/um-eos/eos-sampled-flow-tracking#unique_933198740

Which component of AVD is impacted

eos_cli_config_gen

Use case example

Using Postcard, also known as GREEN-T telemetry on AVD managed devices.

Describe the solution you would like

Schema and templates extended to support Postcard.

Describe alternatives you have considered

Using eos_cli with the whole command line commands. This is not optimal.

Additional context

No response

Contributing Guide

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