### Body

The CLI:

`airflow variables set [-h] [-j] [-v] key VALUE`

https://airflow.apache.org/docs/apache-airflow/stable/cli-and-env-variables-ref.html#set_repeat1

Doesn't support adding description though column exists and we support it from Rest API:
https://airflow.apache.org/docs/apache-airflow/stable/stable-rest-api-ref.html#operation/post_variables

**The Task:**

Allow to set description from cli command

### Committer

- [X] I acknowledge that I am a maintainer/committer of the Apache Airflow project.
#
#
#
"""Variable subcommands."""
from __future__ import annotations
import json
import os
from json import JSONDecodeError
from sqlalchemy import select
from airflow.cli.simple_table import AirflowConsole
from airflow.cli.utils import print_export_output
from airflow.models import Variable
from airflow.utils import cli as cli_utils
from airflow.utils.cli import suppress_logs_and_warning
from airflow.utils.providers_configuration_loader import providers_configuration_loaded
from airflow.utils.session import create_session, provide_session
@suppress_logs_and_warning
@providers_configuration_loaded
def variables_list(args):
    """Display all the variables."""
    with create_session() as session:
        variables = session.scalars(select(Variable)).all()
    AirflowConsole().print_as(data=variables, output=args.output, mapper=lambda x: {"key": x.key})
@suppress_logs_and_warning
@providers_configuration_loaded
def variables_get(args):