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