Execution example::

  tokenize TokenTrigram "日本語の勉強" NormalizerAuto
  # [
  #   [
  #     0,
  #     1546586185.123834,
  #     0.0003123283386230469
  #   ],
  #   [
  #     {
  #       "value": "日本語",
  #       "position": 0,
  #       "force_prefix": false,
  #       "force_prefix_search": false
  #     },
  #     {
  #       "value": "本語の",
  #       "position": 1,
  #       "force_prefix": false,
  #       "force_prefix_search": false
  #     },
  #     {
  #       "value": "語の勉",
  #       "position": 2,
  #       "force_prefix": false,
  #       "force_prefix_search": false
  #     },
  #     {
  #       "value": "の勉強",
  #       "position": 3,
  #       "force_prefix": false,
  #       "force_prefix_search": false
  #     },
  #     {
  #       "value": "勉強",
  #       "position": 4,
  #       "force_prefix": false,
  #       "force_prefix_search": false
  #     },
  #     {
  #       "value": "強",
  #       "position": 5,
  #       "force_prefix": false,
  #       "force_prefix_search": false
  #     }
  #   ]
  # ]
