WebConsole for OSGi configuration serialization

Currently the serialization of OSGi configuration can be achieved via the write back mechanism of the different providers. As very often the location is read-only and also there are different serialization formats (https://sling.apache.org/documentation/bundles/configuration-installer-factory.html) it would be reasonable to instead provide a central web console via the OSGi Installer Core which allows to emit different serialization format per configuration PID. The output is only via HTML.

That way the same serialization logic only needs to be implemented once (instead of multiple times) and the emitted config serialization can be put easily into the SCM files via copy&paste.