Execution example::

  tokenize --tokenizer TokenNgram --string "Hello World" --normalizer NormalizerAuto
  # [
  #   [
  #     0,
  #     1556063752.798628,
  #     0.0001776218414306641
  #   ],
  #   [
  #     {
  #       "value": "hello",
  #       "position": 0,
  #       "force_prefix": false,
  #       "force_prefix_search": false
  #     },
  #     {
  #       "value": "world",
  #       "position": 1,
  #       "force_prefix": false,
  #       "force_prefix_search": false
  #     }
  #   ]
  # ]
