### 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.
with pytest.raises(SystemExit):
            variable_command.variables_get(self.parser.parse_args(["variables", "get", "no-existing-VAR"]))
    def test_variables_set_different_types(self):
        """Test storage of various data types"""
        
        variable_command.variables_set(
            self.parser.parse_args(["variables", "set", "dict", '{"foo": "oops"}'])
        )
        
        variable_command.variables_set(self.parser.parse_args(["variables", "set", "list", '["oops"]']))
        
        variable_command.variables_set(self.parser.parse_args(["variables", "set", "str", "hello string"]))
        
        variable_command.variables_set(self.parser.parse_args(["variables", "set", "int", "42"]))
        
        variable_command.variables_set(self.parser.parse_args(["variables", "set", "float", "42.0"]))
        
        variable_command.variables_set(self.parser.parse_args(["variables", "set", "true", "true"]))
        
        variable_command.variables_set(self.parser.parse_args(["variables", "set", "false", "false"]))
        
        variable_command.variables_set(self.parser.parse_args(["variables", "set", "null", "null"]))
        
        variable_command.variables_export(
            self.parser.parse_args(["variables", "export", "variables_types.json"])
        )
        variable_command.variables_import(
            self.parser.parse_args(["variables", "import", "variables_types.json"])
        )