New Node Type Keys specific to Media

[sugetha24]

Enhancement summary

Need new node type keys for Media devices.

Which component of AVD is impacted

eos_designs

Use case example

Need new node types for m&e devices with custom ptp priorities

Describe the solution you would like

node_type_keys:
  - key: ptp_leaf
    type: ptp_leaf
    default_overlay_routing_protocol: none
    connected_endpoints: true
    network_services:
      l2: true
      l3: true
    default_ptp_priority1: 10
  - key: media_spine
    type: media_spine
    default_overlay_routing_protocol: none
    connected_endpoints: true
    network_services:
      l2: true
      l3: true
    default_ptp_priority1: 20
  - key: media_leaf
    type: media_leaf
    default_overlay_routing_protocol: none
    connected_endpoints: true
    network_services:
      l2: true
      l3: true
    default_ptp_priority1: 30```

### Describe alternatives you have considered

Creating custom device types

### Additional context

_No response_

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