Custom Log Recorder: Inject your own logging backend

### What

Currently external integrators have to use on of the S-CORE provided recorders (ie. backends). With the proposed extension an entry point to route logs to a non-SCORE backend would be provided. Only the feature flag and the file locations would be provided. Non of the actual wrapper/adapter code will be given.

### How

Extend https://github.com/eclipse-score/baselibs/blob/main/score/mw/log/detail/recorder_config.h with an additional `CUSTOM_RECODER` feautre flag and the respective file locations.
Adjust config parser (parser of logging.json). To handle the new backend.

### Estimates for realization

Effort small, no impact expected as feature is off by default.

### Category

- [x] Affects Detailed Design

### Requirements / Architecture

- [x] Requirements / Architecture are not affected by this change?