Returns a map of run paths to `ProjectorConfig` protos.

def configs(self):
    """Returns a map of run paths to `ProjectorConfig` protos."""
    run_path_pairs = list(self.run_paths.items())
    self._append_plugin_asset_directories(run_path_pairs)
    # If there are no summary event files, the projector should still work,
    # treating the `logdir` as the model checkpoint directory.
    if not run_path_pairs:
      run_path_pairs.append(('.', self.logdir))
    if (self._run_paths_changed() or
        _latest_checkpoints_changed(self._configs, run_path_pairs)):
      self.readers = {}
      self._configs, self.config_fpaths = self._read_latest_config_files(
          run_path_pairs)
      self._augment_configs_with_checkpoint_info()
    return self._configs