feat: provide a `to_python` method

[lukapeschke]

Provide a to_python method that would convert data to a list[list[int | float | str | datetime | date | timedelta | None]].

Add a parameter to to_pandas and to_polars methods to allow falling back on python object creation in case to_arrow fails

[noctuid]

Does this require changes to calamine?

[lukapeschke]

Does this require changes to calamine?

I don't think so. But the API for the method needs to be determined