Werk #16360: Dedicated security logging

To make it easier to detect certain security relevant events a dedicated security log is introduced. You can find it in var/log/security.log.

The format of each line is: 1. The date and time the logentry was created (local time) 2. The security domain and the process id. 3. The message as json with a summary and details key. The contents of the details vary by the domain.

Currently the following domains exist: * application_errors: e.g if a CSRF token could not be found/validated * auth: e.g. successful / unsuccessful authentication attempts. (Successful authentication attempts without opening a session are currently not logged.) * service: e.g. the start of a site * user_management: e.g. change of a password

Please note that this logfile is still subject to change. Additional events might be added and details may change with p-releases.

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