Prefix messages for Discord notify component

Feature Requests
1

It would be very handy if the Discord notify component included a setting to prefix messages. Then it could be used to notify specific people on a channel.

e.g.

  - name: discord_john
    platform: group
    services:
      - service: discord
        data:
          target: 345455802896875520
          prefix: "@john "

  - name: discord_doe
    platform: group
    services:
      - service: discord
        data:
          target: 345455802896875520
          prefix: "@doe "

  - name: discord_all
    platform: group
    services:
      - service: discord
        data:
          target: 345455802896875520
          prefix: "@here "

Then depending on which notify service was used, the message would be sent to a specific person.

Main advantage over using the prefix inside the messages itself is to keep the message payload platform agnostic.