Enhancement summary

Static multicast is useful in many M&E installations. It may be needed on uplinks. The CLI would look like this
client(config)#interface Ethernet 1
client(config-if-Et1)#multicast ipv4 static

There is already a way to enable dynamic multicast on uplinks:
underlay_multicast: true

It would be cool if we could have something that operated very similarly to "underlay_multicast: true", but for static multicast.

The AVD could look like:
underlay_multicast_ipv4_static: true
Current Issue is only for fabric links/core interfaces that involves l3 interfaces

Which component of AVD is impacted

eos_designs

Use case example

See enhancement summary

Describe the solution you would like

See enhancement summary

Describe alternatives you have considered

now we need structured config:

ethernet_interfaces:
- name: Ethernet2
  description: P2P_LINK_TO_CORE-2-OSPF-LDP_Ethernet2
  shutdown: false
  speed: 100full
  mtu: 1601
  ip_address: [100.123.123.2/31](http://100.123.123.2/31)
  multicast:
    ipv4:
      static: true

Additional context

This would be used with Arista's MCS or a 3rd party multicast SDN

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