### 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/cli_parser.py
ARG_POOL_SLOTS = Arg(("slots",), type=int, help="Pool slots")
ARG_POOL_DESCRIPTION = Arg(("description",), help="Pool description")
ARG_POOL_IMPORT = Arg(
    ("file",),
    metavar="FILEPATH",
    help="Import pools from JSON file. Example format::\n"
    + textwrap.indent(
        textwrap.dedent(
            '''
            {
                "pool_1": {"slots": 5, "description": ""},
                "pool_2": {"slots": 10, "description": "test"}
            }'''
        ),
        " " * 4,
    ),
)
ARG_POOL_EXPORT = Arg(("file",), metavar="FILEPATH", help="Export all pools to JSON file")
ARG_VAR = Arg(("key",), help="Variable key")
ARG_VAR_VALUE = Arg(("value",), metavar='VALUE', help="Variable value")
ARG_DEFAULT = Arg(
    ("-d", "--default"), metavar="VAL", default=None, help="Default value returned if variable does not exist"
)
ARG_JSON = Arg(("-j", "--json"), help="Deserialize JSON variable", action="store_true")
ARG_VAR_IMPORT = Arg(("file",), help="Import variables from JSON file")
ARG_VAR_EXPORT = Arg(("file",), help="Export all variables to JSON file")
ARG_PRINCIPAL = Arg(("principal",), help="kerberos principal", nargs='?')
ARG_KEYTAB = Arg(("-k", "--keytab"), help="keytab", nargs='?', default=conf.get('kerberos', 'keytab'))
ARG_INTERACTIVE = Arg(
    ('-N', '--interactive'),