Support pandas types

The idea here would be to support types from pandas, like: [`pd.DataFrame`](https://pandas.pydata.org/docs/reference/api/pandas.DataFrame.html).

You can check how other types are implemented for reference. I guess [this](https://github.com/pydantic/pydantic-extra-types/blob/main/pydantic_extra_types/phone_numbers.py) would be the easiest one.