chore(haul-cli): handle unknown args

[jamesgeorge007]

Summary

Leverage yargs API to handle unknown arguments.

Test plan

$ haul unknown

Commands:
  haul.js init          Generates necessary configuration files
  haul.js bundle        Builds the app bundle for packaging. Run with
                        `--platform` flag to specify the platform [ios|android].
  haul.js ram-bundle    Create ram-bundle
  haul.js reload        Sends reload request to all devices that enabled live
                        reload
  haul.js start         Starts a new webpack server
  haul.js multi-bundle  Create multiple bundles to be used in multi-bundle mode

Options:
  -h, --help                Show help                                  [boolean]
  --verbose                 Print all logs including debug messages.   [boolean]
  --output-file <filename>  Log all messages to a file.                 [string]
  --json                    When --output-file is set, log each message as a
                            JSON object.                               [boolean]
  -v, --version             Show version number                        [boolean]

Unknown argument: unknown