Execution example::

  tokenize TokenDelimit "ー—―─━ｰ" --token_filters 'TokenFilterNFKC100("unify_prolonged_sound_mark", true)'
  # [
  #   [
  #     0,
  #     1546907076.575454,
  #     0.0003325939178466797
  #   ],
  #   [
  #     {
  #       "value": "ーーーーーー",
  #       "position": 0,
  #       "force_prefix": false,
  #       "force_prefix_search": false
  #     }
  #   ]
  # ]
