Sanitize keys of each hash of an array.

`replace_dot_in_key_with`, `replace_dollar_in_key_with` options should sanitize keys of each hash of an array like the following.

config:
```
<match foo.*>
  replace_dot_in_key_with _dot_
  replace_dollar_in_key_with _dollar_
</match>
```

input data:
```
"foo.bar": [
  {
    "$foo$bar": "baz"
  }
]
```

the record which will be stored:
```json
"foo_dot_bar": [
  {
    "_dollar_foo$bar": "baz"
  }
]
```