### 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/utils/test_dot_renderer.py
'shape=rectangle style="filled,rounded"]',
                '\t\t\t"section_2.inner_section_2.task_3" [color="#000000" fillcolor="#e8f7e4" label=task_3 '
                'shape=rectangle style="filled,rounded"]',
                '\t\t\t"section_2.inner_section_2.task_4" [color="#000000" fillcolor="#e8f7e4" label=task_4 '
                'shape=rectangle style="filled,rounded"]',
                '\t\t}',
                '\t\t"section_2.task_1" [color="#000000" fillcolor="#e8f7e4" label=task_1 shape=rectangle '
                'style="filled,rounded"]',
                '\t}',
                '\tstart [color="#000000" fillcolor="#e8f7e4" label=start shape=rectangle '
                'style="filled,rounded"]',
                '\t"section_1.downstream_join_id" -> "section_2.upstream_join_id"',
                '\t"section_1.task_1" -> "section_1.task_2"',
                '\t"section_1.task_1" -> "section_1.task_3"',
                '\t"section_1.task_2" -> "section_1.downstream_join_id"',
                '\t"section_1.task_3" -> "section_1.downstream_join_id"',
                '\t"section_1.upstream_join_id" -> "section_1.task_1"',
                '\t"section_2.downstream_join_id" -> end',
                '\t"section_2.inner_section_2.task_2" -> "section_2.inner_section_2.task_4"',
                '\t"section_2.inner_section_2.task_3" -> "section_2.inner_section_2.task_4"',
                '\t"section_2.inner_section_2.task_4" -> "section_2.downstream_join_id"',
                '\t"section_2.task_1" -> "section_2.downstream_join_id"',
                '\t"section_2.upstream_join_id" -> "section_2.inner_section_2.task_2"',
                '\t"section_2.upstream_join_id" -> "section_2.inner_section_2.task_3"',
                '\t"section_2.upstream_join_id" -> "section_2.task_1"',
                '\tstart -> "section_1.upstream_join_id"',
                '}',
            ]
        )