The work involved in this ticket is to move session_set_last_error function outside of the session API and change __wti_schema_session_release to save the last set error from the internal session to the original session before being released. Specifically the struct err_info should be saved from int_session to session.

Definition of done

The session_get_last_error function is moved outside of the API, with python and unit tests, and the last set err_info struct is captured from the internal session to the original session.