### Description

Airflow Connection testing using airflow CLI would be very useful  , where users can quick add test function to test connection in their applications. It will benefit CLI user to create and test new connections right from instance and reduce time on troubleshooting any connection issue. 

### Use case/motivation

airflow connection testing using airflow CLI , similar function as we have in Airflow CLI. 
example:  airflow connection test "hello_id"

### Related issues

N/A

### 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)

return
    return val.strip().lower()
ARG_DAG_ID = Arg(("dag_id",), help="The id of the dag")
ARG_TASK_ID = Arg(("task_id",), help="The id of the task")
ARG_EXECUTION_DATE = Arg(("execution_date",), help="The execution date of the DAG", type=parsedate)
ARG_EXECUTION_DATE_OPTIONAL = Arg(
    ("execution_date",), nargs="?", help="The execution date of the DAG (optional)", type=parsedate
)
ARG_EXECUTION_DATE_OR_RUN_ID = Arg(
    ("execution_date_or_run_id",), help="The execution_date of the DAG or run_id of the DAGRun"
)
ARG_EXECUTION_DATE_OR_RUN_ID_OPTIONAL = Arg(
    ("execution_date_or_run_id",),
    nargs="?",
    help="The execution_date of the DAG or run_id of the DAGRun (optional)",
)
ARG_TASK_REGEX = Arg(
    ("-t", "--task-regex"), help="The regex to filter specific task_ids to backfill (optional)"
)
ARG_SUBDIR = Arg(
    ("-S", "--subdir"),
    help=(
        "File location or directory from which to look for the dag. "
        "Defaults to '[AIRFLOW_HOME]/dags' where [AIRFLOW_HOME] is the "
        "value you set for 'AIRFLOW_HOME' config you set in 'airflow.cfg' "
    ),
    default="[AIRFLOW_HOME]/dags" if BUILD_DOCS else settings.DAGS_FOLDER,
)
ARG_START_DATE = Arg(("-s", "--start-date"), help="Override start_date YYYY-MM-DD", type=parsedate)
ARG_END_DATE = Arg(("-e", "--end-date"), help="Override end_date YYYY-MM-DD", type=parsedate)