Add supported channels to the Skills manifest

[clearab]

Because there are channel-specific a bot may do, it is important that a skill consumer be aware of the channels supported by the child bot.

An optional "targetedChannels" (maybe "supportedChannels"?) array should be added in the "properties" section. Potentially:

"properties": {
...
    "targetedChannels": {

        "type": "array",

        "uniqueItems": true,

        "description": "List of channels the skill is designed to work in",

        "items": {

            "$ref": "#/definitions/targetedChannels"

         }

    }
...
}

[cleemullins]

Assigned to @scheyal for scoping and possible inclusion in R8.

[clearab]

This one is for me :)

[gabog]

Hi @clearab, do you think we should address this as part of R11? Or close it? or Backlog it?

[cwhitten]

@carlosscastro can you check in here? there could be overlap with the in-proc adapter modeling