Add CERN Let's Encrypt DNS-01 solver
This feature adds a subcommand to the landb-sync utility to create a server that listens to calls to 'acme.kubernetes.cern.ch' objects to solve a DNS-01 cert-manager challenge. This feature depends on the provided CSREST API REST interface and the src files are generated from the documentation available online.
For more information follow the original issue at https://gitlab.cern.ch/kubernetes/networking/landb-sync/-/issues/5