Move log and debug config for each service into an own config file for that service

Similar as we do right now for tracing where the tracing config goes into an own file `tracing.go` for each service, I propose that the log and debug info is **consistently** extracted from the current `config.go` file into an own `log.go` and `debug.go` file for each service making the configs much more consistent and readable.

Some services like the `notification` service already have that scheme - this should be consistently used.