### Description

Recently, we added [a new DAG dependencies view](https://github.com/apache/airflow/pull/13199) to the webserver. It would be helpful if a similar diagram could also be displayed/generated using the CLI. For now, only [one DAG can be displayed](http://airflow.apache.org/docs/apache-airflow/stable/usage-cli.html#exporting-dag-structure-as-an-image) using CLI.
![image](https://user-images.githubusercontent.com/12058428/137945580-6a33f919-2648-4980-bd2c-b40cfcacc9fe.png)

If anyone is interested, I will be happy to help with the review.

### Use case/motivation

* Keep parity between CLI and web serwer.
* Enable the writing of scripts that use these diagrams, e.g. for attaching in the documentation.

### Related issues

https://github.com/apache/airflow/pull/13199/files

### Are you willing to submit a PR?

- [ ] Yes I am willing to submit a PR!

### Code of Conduct

- [X] I agree to follow this project's [Code of Conduct](https://github.com/apache/airflow/blob/main/CODE_OF_CONDUCT.md)

airflow/cli/commands/dag_command.py
print(str(e))
    show_dagrun = args.show_dagrun
    imgcat = args.imgcat_dagrun
    filename = args.save_dagrun
    if show_dagrun or imgcat or filename:
        tis = (
            session.query(TaskInstance)
            .filter(
                TaskInstance.dag_id == args.dag_id,
                TaskInstance.execution_date == args.execution_date,
            )
            .all()
        )
        dot_graph = render_dag(dag, tis=tis)
        print()
        if filename:
            _save_dot_to_file(dot_graph, filename)
        if imgcat:
            _display_dot_via_imgcat(dot_graph)
        if show_dagrun:
            print(dot_graph.source)
@provide_session
@cli_utils.action_logging
def dag_reserialize(args, session=None):
    session.query(SerializedDagModel).delete(synchronize_session=False)
    if not args.clear_only:
        dagbag = DagBag()
        dagbag.collect_dags(only_if_updated=False, safe_mode=False)
        dagbag.sync_to_db()