Library useTimestamps and useSoftDeletes from codeigniter 4 to 3

Hello everyone.

This is a first implementation of a library that resembles Codeigniter 4's useTimestamps and useSoftDeletes.

The branch link its here.

Discussion on whether or not to use this functionality is open. I, in particular, found the functionality useful in Codeigniter 4 and wanted to bring it in "parts" to Ci3.