Add OCPP AuthEnabled support

### Describe the problem

EVerest does not support a way to disable authorization via OCPP. In a lot of cases the CPO wants to be able to put a charger in an NoAuth or Free Charge mode. A CPO wont be able to change the EVerest config for this. This should be done via OCPP.

### EVerest Domain

Authorization

### Affected Component

lib/ocpp

### Describe your solution

Add AuthEnabled to OCPP 1.6 and OCPP 2.x

In OCPP 2.x this is called: AuthEnabled see: C01.FR.01. This is optional, but a nice extension of EVerest.
Maybe we should use the same name for OCPP 1.6.

Default should be that this is enabled.

### Alternatives considered

_No response_

### Additional context

_No response_

Start in lib/ocpp and trace how OCPP 1.6 and OCPP 2.x authorization settings are represented and applied. Add AuthEnabled support for both protocol versions, keeping authorization enabled by default, and verify that it can provide the requested NoAuth or Free Charge behavior.

Written by the indexing model from the issue text.