Define custom prefix for Redis and Memcached

[carlitorweb]

Is your feature request related to a problem? Please describe.

In environments where resources are shared between multiple sites, not being able to define a custom prefix for Redis or Memcache operations causes them to overwrite each other.

Describe the solution you'd like

Add to the configuration file the possibility of defining these prefixes (and we can edit it trought Global Configuration in the administrator page). Currently, for example in the case of the session with Redis, the prefix is set "hardcode"

joomla-cms/libraries/src/Session/SessionFactory.php

Line 85 in 301bdf2

$memcached = new \Memcached($config->get('session_memcached_server_id', 'joomla_cms'));