### 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)

"""Create a lazy loader for command."""
    _, _, name = import_path.rpartition(".")
    def command(*args, **kwargs):
        func = import_string(import_path)
        return func(*args, **kwargs)
    command.__name__ = name
    return command
class DefaultHelpParser(argparse.ArgumentParser):
    """CustomParser to display help message."""
    def _check_value(self, action, value):
        """Override _check_value and check conditionally added command."""
        if action.dest == "subcommand" and value == "celery":
            executor = conf.get("core", "EXECUTOR")
            if executor not in (CELERY_EXECUTOR, CELERY_KUBERNETES_EXECUTOR):
                executor_cls, _ = ExecutorLoader.import_executor_cls(executor)
                classes = ()
                try:
                    from airflow.executors.celery_executor import CeleryExecutor
                    classes += (CeleryExecutor,)
                except ImportError:
                    message = (
                        "The celery subcommand requires that you pip install the celery module. "
                        "To do it, run: pip install 'apache-airflow[celery]'"
                    )
                    raise ArgumentError(action, message)
                try:
                    from airflow.executors.celery_kubernetes_executor import CeleryKubernetesExecutor