### Description

Add listeners for Datasets (events)

### Use case/motivation

As Airflow administrators, we would like to trigger some external processes based on all datasets being created/updated by our users. We came across the listeners for the dag runs and task instances (which are also useful), but are still missing listeners for datasets.

### Related issues

_No response_

### 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 settings.ALLOW_FUTURE_EXEC_DATES and not self.timetable.can_be_scheduled
    @provide_session
    def get_concurrency_reached(self, session=NEW_SESSION) -> bool:
        """Return a boolean indicating whether the max_active_tasks limit for this DAG has been reached."""
        TI = TaskInstance
        total_tasks = session.scalar(
            select(func.count(TI.task_id)).where(
                TI.dag_id == self.dag_id,
                TI.state == TaskInstanceState.RUNNING,
            )
        )
        return total_tasks >= self.max_active_tasks
    @property
    def concurrency_reached(self):
        """Use `airflow.models.DAG.get_concurrency_reached`, this attribute is deprecated."""
        warnings.warn(
            "This attribute is deprecated. Please use `airflow.models.DAG.get_concurrency_reached` method.",
            RemovedInAirflow3Warning,
            stacklevel=2,
        )
        return self.get_concurrency_reached()
    @provide_session
    def get_is_active(self, session=NEW_SESSION) -> None:
        """Return a boolean indicating whether this DAG is active."""
        return session.scalar(select(DagModel.is_active).where(DagModel.dag_id == self.dag_id))
    @provide_session
    def get_is_paused(self, session=NEW_SESSION) -> None: