Search service in Hippo 12.0: change dependency model

Since CMS-10098 the search service bootstraps itself as hippo:module instead of being instantiated by the advanced search.

However, the three artifacts org.onehippo.cms7:hippo-search-service-* are pulled in through the advanced search addon, so the search service cannot be used it outside of advanced search yet.

Therefore the dependency model should be different, probably add the three to hippo-cms-dependencies module (and remove from advanced search of course).