Returns the details for a given project role in a project.
        :param project_key:
        :param role_id:
        :return:

def get_project_actors_for_role_project(self, project_key, role_id):
        """
        Returns the details for a given project role in a project.
        :param project_key:
        :param role_id:
        :return:
        """
        url = 'rest/api/2/project/{projectIdOrKey}/role/{id}'.format(projectIdOrKey=project_key,
                                                                     id=role_id)
        return (self.get(url) or {}).get('actors')