Feat(eos_cli_config_gen): add support for mlag peer-link requests disabled under dhcp_relay

[kmueller68]

Enhancement summary

From EOS 4.28.0F this option is supported under dhcp_relay to suppress flooding of VTEP decapsulated dhcp packets over the MLAG. https://www.arista.com/en/support/toi/eos-4-25-1f/14626-head-end-replicated-dhcp-packets-suppression-in-vxlan-network

switch(config)# dhcp relay switch(dhcp-relay)# mlag peer-link requests disabled

Which component of AVD is impacted

eos_cli_config_gen

Use case example

running-config:

dhcp relay
  mlag peer-link requests disabled

Describe the solution you would like

dhcp_relay:
  servers:
    - <str>
  tunnel_requests_disabled: <bool>
  mlag_peerlink_requests_disabled: <bool>

Describe alternatives you have considered

use eos_cli

Additional context

No response

Contributing Guide

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[ClausHolbechArista]

Data model looks good. Thank you!