Feat(eos_cli_config_gen): Add support for configuring dhcp server ipv4 and dhcp server ipv6 for Vlan interfaces

[kmueller68]

Enhancement summary

We are missing dhcp_server_ipv4 and dhcp_server_ipv6 attribute in eos_cli_config_gen schema for Vlan interface.
Allow eos_cli_config_gen schema to configure "dhcp server ipv4" and "dhcp server ipv6" eos cli under Vlan interface based on presence of dhcp_server_ipv4 or dhcp_server_ipv6 schema bool attribute set to true for a vlan_interface when included within generated structured config.

interface Vlan10
   description WiFi users
   ip address 10.10.10.1/24
   dhcp server ipv4
   dhcp server ipv6

Which component of AVD is impacted

eos_cli_config_gen

Use case example

please detail your use case

vlan_interfaces:
  - name: Vlan10
    # Enable IPv4 DHCP server.
    dhcp_server_ipv4: true

    # Enable IPv6 DHCP server.
    dhcp_server_ipv6: true

should render

interface Vlan10
   dhcp server ipv4
   dhcp server ipv6

Describe the solution you would like

vlan_interfaces:
  - name: <str; required; unique>

    # Enable IPv4 DHCP server.
    dhcp_server_ipv4: <bool>

    # Enable IPv6 DHCP server.
    dhcp_server_ipv6: <bool>

Describe alternatives you have considered

Use eos cli option:

vlan_interfaces:
  - name: "Vlan3198"
    description: VL_MGMT
    shutdown: false
    vrf: default
    eos_cli: |
      dhcp server ipv4
      dhcp server ipv6

Additional context

No response

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