Draft: Splitting up the repository into the library and interface

Because the different interfaces have different requirements and will be deployed separately depending on the location it makes sense to split up the repository into the core library and the interface. So only the required dependencies for each interface need to be installed.

This merge request splits up the repository into igwn-lldd, igwn-lldd-lsmp, igwn-lldd-fdio and igwn-lldd-fdio and separates the build, tests and the CI pipeline.