Update coding guidelines
We have the Stork coding guidelines documented here: https://gitlab.isc.org/isc-projects/stork/-/wikis/Processes/coding-guidelines#go-style. However, this document was written at the beginning of the Stork development. At this time we didn't have enough experience in Golang and Typescript to write a comprehensive set of guidelines. Today, we have a lot more experience and a lot more to write.
This ticket came up during the !553 (merged) review. In this MR we wondered about the naming convention for continue labels. We think it should be camel case. We need to include it in the guidelines.