Enhancement: PHP notice for the logging plugin

# Overview

We need to add an admin notice for any user that uses PHP 8.0 or below to notify them that the plugin is not compatible with their current version of PHP.

We intentionally used PHP 8.1 as the min version for a few reasons including that Monolog requires PHP 8.1 and also that upgrading PHP would be one of the first steps you would do when fixing performance issues.