### 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)

tests/cli/commands/test_dag_command.py
)
class TestCliDags(unittest.TestCase):
    @classmethod
    def setUpClass(cls):
        cls.dagbag = DagBag(include_examples=True)
        cls.dagbag.sync_to_db()
        cls.parser = cli_parser.get_parser()
    @classmethod
    def tearDownClass(cls) -> None:
        clear_db_runs()
        clear_db_dags()
    def test_reserialize(self):
        
        with create_session() as session:
            serialized_dags_before_command = session.query(SerializedDagModel).all()
        assert len(serialized_dags_before_command)  
        
        dag_command.dag_reserialize(self.parser.parse_args(['dags', 'reserialize', "--clear-only"]))
        
        with create_session() as session:
            serialized_dags_after_clear = session.query(SerializedDagModel).all()
        assert not len(serialized_dags_after_clear)
        
        dag_command.dag_reserialize(self.parser.parse_args(['dags', 'reserialize']))
        
        with create_session() as session:
            serialized_dags_after_reserialize = session.query(SerializedDagModel).all()
        assert len(serialized_dags_after_reserialize) >= 40  
    @mock.patch("airflow.cli.commands.dag_command.DAG.run")
    def test_backfill(self, mock_run):