Add support for Pandas.StringDtype

[jdglaser]

pandas.StringDtype is still experimental, but we should probably add support for it.

[wanwencwanwenc]

I have a similar issue when load NaN to SQL. The column I have issue with is an Object in dataframe. The value is NaN. I use ODBC Driver 17 for SQL Server as my driver and I tried to ingest the data to MS SQL database.

When I use to_sql() function. I have no issues.

But when I use fast_to_sql(), I have below errors:

The error message I have is:
DataError: ('22018', '[22018] [Microsoft][ODBC Driver 17 for SQL Server]Invalid character value for cast specification (0) (SQLParamData)')

I think it is failed because of the NaN value.

Thank you for taking a look!