Add system option: allow newly discovered device_trackers to be Enabled

Copying from 2022.2: Let's start streamlining!:

personally, I really wish we had an option to allow new device_trackers to be enabled upon discovery. since https://github.com/home-assistant/core/pull/63328 newly discovered device_trackers are disabled,

and have no attributes in the entity_registry_updated event_type resulting in:

using:

  - alias: New device registered config
    id: New device registered config
    mode: queued
    trigger:
      platform: event
      event_type: entity_registry_updated
      event_data:
        action: create
    condition: >
      {{trigger.event.data.entity_id.startswith('device_tracker')}}
    action:
      - variables:
          data: >
            {{trigger.event.data}}
          entity: >
            {{trigger.event.data.entity_id}}
          name: >
            {{state_attr(entity,'friendly_name')}}
          host: >
            {{state_attr(entity,'host_name')}}
          ip: >
            {{state_attr(entity,'ip')}}
          mac: >
            {{state_attr(entity,'mac')}}
          source: >
            {{state_attr(entity,'source_type')}}
          id: >
            {{device_id(entity)}}
          config: >
            - entity: {{entity}},

            - name: {{name}},

            - host: {{host}},

            - ip: {{ip}},

            - mac: {{mac}},

            - source_type: {{source_type}}

            - id: {{id}}
          time: >
            {{now().timestamp()|timestamp_custom('%X')}}
          title: >
            {{time}} - New device registered: {{name}}
          message_body: >
           New device config: {{config}}

(devices that are enabled upon discovery according to the new device_tracker logic do show all/most of these fields populated.)

after enabling the tracker we can see all attributes are in fact there:

Please consider either adding a system option to enabled, or, if possible,provide details also on disabled device_trackers…