### Body

There are some use cases where users want to trigger new DAG run as soon as one finished. This is a request I've seen several times with some variations (for example like this [Stackoverflow question](https://stackoverflow.com/q/75623153/14624409)) but the basic request is the same.

The workaround users do to get such functionality is place `TriggerDagRunOperator` as last task of their DAG invoking the same DAG:

```
from datetime import datetime

from airflow import DAG
from airflow.operators.empty import EmptyOperator
from airflow.operators.trigger_dagrun import TriggerDagRunOperator

with DAG(
    dag_id="example",
    start_date=datetime(2023, 1, 1,),
    catchup=False,
    schedule=None,
) as dag:
    task = EmptyOperator(task_id="first")
    trigger = TriggerDagRunOperator(
        task_id="trigger",
        trigger_dag_id="example",
    )

    task >> trigger

```

As you can see this works nicely:
![Screenshot 2023-03-03 at 14 20 51](https://user-images.githubusercontent.com/45845474/222718862-dfde8a41-24b6-4991-b318-b7f9784514f6.png)

My suggestion is to add first class support for this use case, so the above example will be changed to:

```

from datetime import datetime

from airflow import DAG
from airflow.operators.empty import EmptyOperator
from airflow.operators.trigger_dagrun import TriggerDagRunOperator

with DAG(
    dag_id="example",
    start_date=datetime(2023, 1, 1,),
    catchup=False,
    schedule="@continues",
) as dag:
    task = EmptyOperator(task_id="first")
```

I guess it won't exactly be `"@continues"` but more likely new [ScheduleArg](https://github.com/apache/airflow/blob/8b8552f5c4111fe0732067d7af06aa5285498a79/airflow/models/dag.py#L127) type but I show it like that just for simplification of the idea.

### Committer

- [X] I acknowledge that I am a maintainer/committer of the Apache Airflow project.
dag = DAG("test-dag", render_template_as_native_obj=use_native_obj)
        jinja_env = dag.get_template_env(force_sandboxed=force_sandboxed)
        assert isinstance(jinja_env, expected_env)
    def test_resolve_template_files_value(self):
        with NamedTemporaryFile(suffix=".template") as f:
            f.write(b"{{ ds }}")
            f.flush()
            template_dir = os.path.dirname(f.name)
            template_file = os.path.basename(f.name)
            with DAG("test-dag", start_date=DEFAULT_DATE, template_searchpath=template_dir):
                task = EmptyOperator(task_id="op1")
            task.test_field = template_file
            task.template_fields = ("test_field",)
            task.template_ext = (".template",)
            task.resolve_template_files()
        assert task.test_field == "{{ ds }}"
    def test_resolve_template_files_list(self):
        with NamedTemporaryFile(suffix=".template") as f:
            f.write(b"{{ ds }}")
            f.flush()
            template_dir = os.path.dirname(f.name)
            template_file = os.path.basename(f.name)
            with DAG("test-dag", start_date=DEFAULT_DATE, template_searchpath=template_dir):
                task = EmptyOperator(task_id="op1")
            task.test_field = [template_file, "some_string"]
            task.template_fields = ("test_field",)
            task.template_ext = (".template",)
            task.resolve_template_files()
        assert task.test_field == ["{{ ds }}", "some_string"]
    def test_following_previous_schedule(self):