Add support for Arabic numeral input

Example:
input = "500兆"
In python it is in chinese_mix.py
```python
def text_normalize(text):
    numbers = re.findall(r"\d+(?:\.?\d+)?", text)
    for number in numbers:
        text = text.replace(number, cn2an.an2cn(number), 1)
    text = replace_punctuation(text)
    return text
```
Third party is used https://github.com/Ailln/cn2an