### 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
data = dot.pipe(format='png')
    try:
        with subprocess.Popen("imgcat", stdout=subprocess.PIPE, stdin=subprocess.PIPE) as proc:
            out, err = proc.communicate(data)
            if out:
                print(out.decode('utf-8'))
            if err:
                print(err.decode('utf-8'))
    except OSError as e:
        if e.errno == errno.ENOENT:
            raise SystemExit(
                "Failed to execute. Make sure the imgcat executables are on your systems \'PATH\'"
            )
        else:
            raise
def _save_dot_to_file(dot: Dot, filename: str):
    filename_without_ext, _, ext = filename.rpartition('.')
    dot.render(filename=filename_without_ext, format=ext, cleanup=True)
    print(f"File {filename} saved")
@cli_utils.action_logging
def dag_state(args):