code: public GroupId findGroup(DbSession dbSession, Request request) {
      return GroupId.from(findGroupDto(dbSession, request));
    }
docs: Find a group by its id (parameter {@link #PARAM_GROUP_ID}) or couple organization key/group name
  (parameters {@link #PARAM_ORGANIZATION_KEY} and {@link #PARAM_GROUP_NAME}). The virtual
  group "Anyone" is not supported.
  
  @throws NotFoundException if parameters are missing/incorrect, if the requested group does not exist
  or if the virtual group "Anyone" is requested.