track visits and visitors

Problem/Motivation

In addition to logging page views, we want to log visitors and visits.

https://matomo.org/faq/general/faq_146/

_pk_ses – 30 minutes (short lived cookies used to temporarily store data for the visit)

Track the session so we can calculate the number of visits, and actions per visit

Steps to reproduce

Proposed resolution

Remaining tasks

User interface changes

API changes

Data model changes

Rename table: visitors => visitors_log
New table: visitors_visit
New Table: visitors