Delete an image
stream-cli chat delete-image --channel-type [channel-type] --channel-id [channel-id] --image-url [image-url] [flags]
  -i, --channel-id string     [required] Channel id to interact with
  -t, --channel-type string   [required] Channel type to interact with
  -h, --help                  help for delete-image
  -u, --image-url string      [required] URL of the image to delete
      --app string      [optional] Application name to use as it's defined in the configuration file
      --config string   [optional] Explicit config file path