refactor: Add support for plain SOQL query

[Asafkbalink]

• Remove the need for providing "sfdc_fields", "sfdc_object_name" and "sfdc_c".
• Require an SQL query

Depends on 3.4.0 provided earlier

[cla-checker-service[bot]]

❌ Author of the following commits did not sign a Contributor Agreement: , , , 63013e05648509a32eff7e09e3dda684a50dfd70

Please, read and sign the above mentioned agreement if you want to contribute to this project