KNX Binding: Enable logging for calimero

The KNX binding uses [calimero](https://github.com/calimero-project/calimero) as i/o library to access the KNX bus. Calimero has its own and very specific logging framework, which - at the moment - causes that calimero is not logging at all.

This patch introduces an adapter that works as a bridge between the calimero logging api and slf4j/logback. When applying this patch, calimero will send its log events to slf4j and thus it can be controlled via logback.xml.

This is a huge help when troubleshooting problems with the KNX binding and the KNX bus.