ENH: to_sql support DB-API other than sqlite3/sqlalchemy (eg peewee ORM)
#### Is your feature request related to a problem?

I can't use, to_sql, api to insert data to a database table that complies with DB-API (pep-249) v2. 


#### Describe the solution you'd like


I would like to use, to_sql, to insert data to a database table that complis with DB-API (pep-249) v2.  
Example, I use peewee ORM (not sqlalchemy / sqlite3 connections) to interact with a database that has a DB-API v2 driver.


#### Describe alternatives you've considered

I'm pulling each row of the dataframe to do inserts using threading.  But I'd like this api to support connections other than sqlalchemy and sqlite3.

