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Does Prefect 2 have an equivalent of callable task name generators from Prefect 1?  For flows that map inputs over tasks.
Prefect 1 example (this names the mapped children tasks in cloud UI):

```def generate_task_run_name_foo(dataset: dict, **kwargs):
    return 'Foo:  ' + dataset['name']


@task(max_retries=RETRY_COUNT, retry_delay=RETRY_DELAY, log_stdout=True, task_run_name=generate_task_run_name_foo)
def foo(dataset: dict):
	...```

so far it looks like the `foo` args are not being passed into `generate_task_run_name_foo` like they would in Prefect 1:

```TypeError: generate_task_run_name_foo() missing 1 required positional argument: 'dataset'```