Execution example:

```shell
tokenize \
  'TokenMecab("use_reading", true)' \
  "私は林檎を食べます。" \
  --token_filters 'TokenFilterNFKC("unify_kana", true)'
# [
#   [
#     0,
#     1337566253.89858,
#     0.000355720520019531
#   ],
#   [
#     {
#       "value": "わたし",
#       "position": 0,
#       "force_prefix": false,
#       "force_prefix_search": false
#     },
#     {
#       "value": "は",
#       "position": 1,
#       "force_prefix": false,
#       "force_prefix_search": false
#     },
#     {
#       "value": "りんご",
#       "position": 2,
#       "force_prefix": false,
#       "force_prefix_search": false
#     },
#     {
#       "value": "を",
#       "position": 3,
#       "force_prefix": false,
#       "force_prefix_search": false
#     },
#     {
#       "value": "たべ",
#       "position": 4,
#       "force_prefix": false,
#       "force_prefix_search": false
#     },
#     {
#       "value": "ます",
#       "position": 5,
#       "force_prefix": false,
#       "force_prefix_search": false
#     },
#     {
#       "value": "。",
#       "position": 6,
#       "force_prefix": false,
#       "force_prefix_search": false
#     }
#   ]
# ]
```
