DB batch methods: code review (v4.0.4)

I didn’t follow all this but you seem to have your head around it, so if you want to submit a Pull Request it might be easier to review.

Breaking Changes https://github.com/codeigniter4/CodeIgni...ng-changes

For this reason, a pull request to move the database drivers to the "Drivers" directory was denied.
This is a simple operation without breaking backward compatibility. But...

Many pitfalls. Some changes may break backward compatibility. 
I myself do not yet fully understand how serious the consequences of the changes can be.

I expect the CI community to share their ideas on this topic.