Add option to disable or configure separately DNS protocols

[ilbarone87]

Some CNI, like Cilium that is largely used, do not allow to share the same port for different protocols (TCP and UDP) when using their IPAM solution. This make the use of annotation "io.cilium/lb-ipam-sharing-key: pi-hole" not possibile. Would be nice if we can have the possibility to disable the UDP protocol or having the ability to configure separately the annotations so it's not mandatory to expose the UDP protocol as well. Thanks