Enhancement summary

Please add native knobs for SVIs supporting the things below instead of relying on structured config and raw_eos_cli.

<..>
        svis:
          - id: 123
            <..>
            ipv6_enable: true
            ipv6_address_virtuals: 
              - <..>
            structured_config:
              ipv6_dhcp_relay_destinations:
                - address: <..>
                - address: <..>
            raw_eos_cli: |    
              ipv6 nd ra dns-server <ipv6_ip1>
              ipv6 nd ra dns-server <ipv6_ip2>

Will likely require eos_cli_config_gen work for the dns-server options.

Which component of AVD is impacted

eos_designs

Use case example

Customer case.

Describe the solution you would like

.

Describe alternatives you have considered

No response

Additional context

No response

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