Add validation to add a service dependency for new conjure projects

[mswintermeyer]

What happened?

When adding conjure projects in a repo, no serviceDependency block is added automatically, nor is there any validation to check that one was added. Thus, the default is to not add one. And that's unsafe because other services can add a client dependency on the API, and have that not enforced with pdeps.

What did you want to happen?

There should be validation that enforces that for each module defining conjure APIs, either a compliant serviceDependency block is added or people configure some variable in build.gradle signifying that this API is not only hosted by a service in the repo