### 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.
ARG_VERBOSE,
        ),
    ),
    ActionCommand(
        name="test",
        help="Test a connection",
        func=lazy_load_command("airflow.cli.commands.connection_command.connections_test"),
        args=(ARG_CONN_ID, ARG_VERBOSE),
    ),
    ActionCommand(
        name="create-default-connections",
        help="Creates all the default connections from all the providers",
        func=lazy_load_command("airflow.cli.commands.connection_command.create_default_connections"),
        
        args=(ARG_VERBOSE,),
    ),
)
PROVIDERS_COMMANDS = (
    ActionCommand(
        name="list",
        help="List installed providers",
        func=lazy_load_command("airflow.cli.commands.provider_command.providers_list"),
        args=(ARG_OUTPUT, ARG_VERBOSE),
    ),
    ActionCommand(
        name="get",
        help="Get detailed information about a provider",
        func=lazy_load_command("airflow.cli.commands.provider_command.provider_get"),
        args=(ARG_OUTPUT, ARG_VERBOSE, ARG_FULL, ARG_COLOR, ARG_PROVIDER_NAME),
    ),