docs: def _get_controllers(self):
          """Iterate through the installed controller entry points and import
          the module and assign the handle to the CLI._controllers dict.
  
          :return: dict
  
          """
          controllers = dict()
          for pkg in pkg_resources.iter_entry_points(group=self.CONTROLLERS):
              LOGGER.debug('Loading %s controller', pkg.name)
              controllers[pkg.name] = importlib.import_module(pkg.module_name)
          return controllers