### 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 f"<DAG: {self.dag_id}>"
    def __eq__(self, other):
        if type(self) == type(other):
            
            
            return all(getattr(self, c, None) == getattr(other, c, None) for c in self._comps)
        return False
    def __ne__(self, other):
        return not self == other
    def __lt__(self, other):
        return self.dag_id < other.dag_id
    def __hash__(self):
        hash_components = [type(self)]
        for c in self._comps:
            
            if c == "task_ids":
                val = tuple(self.task_dict)
            else:
                val = getattr(self, c, None)
            try:
                hash(val)
                hash_components.append(val)
            except TypeError:
                hash_components.append(repr(val))
        return hash(tuple(hash_components))
    
    def __enter__(self):
        DagContext.push_context_managed_dag(self)
        return self
    def __exit__(self, _type, _value, _tb):