**Description**

I have noticed that the stable REST API doesn't have the ability to run a task (which is possible from the airflow web interface.
I think it would be nice to have either:
- Run task 
- Run all failing tasks (rerun from point of failure)
this ability for integrations.

**Use case / motivation**

I would like the ability to identify the failing tasks on a specific DAG Run and rerun only them.
I would like to do it remotely (non-interactive) using the REST API.
I could write a script that run only the failing tasks, but I couldn't find a way to "Run" a task, when I have the task instance ID.

**Are you willing to submit a PR?**

Not at this stage

**Related Issues**



tests/api_connexion/schemas/test_task_instance_schema.py
def setUp(self):
        self.default_time = datetime(2020, 1, 1)
        with DAG(dag_id="TEST_DAG_ID"):
            self.task = DummyOperator(task_id="TEST_TASK_ID", start_date=self.default_time)
        self.default_ti_init = {
            "execution_date": self.default_time,
            "state": State.RUNNING,
        }
        self.default_ti_extras = {
            "start_date": self.default_time + dt.timedelta(days=1),
            "end_date": self.default_time + dt.timedelta(days=2),
            "pid": 100,
            "duration": 10000,
            "pool": "default_pool",
            "queue": "default_queue",
        }
    def tearDown(self):