__name__ is not defined on functools.partial objects

[phargogh]

To reproduce:

1. create a task with a functools.partial object as the target callable.
2. run the graph.

The resulting exception is:

[1] [14:18:57.480] [main.js] Traceback (most recent call last):
[1]   File "/Users/jdouglass/workspace/phargogh/invest/env310/bin/invest", line 8, in <module>
[1]
[1] [14:18:57.480] [main.js]     sys.exit(main())
[1]   File "/Users/jdouglass/workspace/phargogh/invest/src/natcap/invest/cli.py", line 486, in main
[1]     model_module.execute(parsed_datastack.args)
[1]   File "/Users/jdouglass/workspace/phargogh/invest/src/natcap/invest/urban_nature_access.py", line 572, in execute
[1]     kernel_tasks[search_radius_m] = graph.add_task(
[1]   File "/Users/jdouglass/workspace/phargogh/invest/env310/lib/python3.10/site-packages/taskgraph/Task.py", line 625, in add_task
[1]
[1] [14:18:57.481] [main.js]     new_task = Task(
[1]   File "/Users/jdouglass/workspace/phargogh/invest/env310/lib/python3.10/site-packages/taskgraph/Task.py", line 1003, in __init__
[1]
[1] [14:18:57.481] [main.js]     scrubbed_value = _scrub_task_args(arg, self._target_path_list)
[1]   File "/Users/jdouglass/workspace/phargogh/invest/env310/lib/python3.10/site-packages/taskgraph/Task.py", line 1459, in _scrub_task_args
[1]
[1] [14:18:57.481] [main.js]     return '%s:%s' % (base_value.__name__, source_code)
[1] AttributeError: 'functools.partial' object has no attribute '__name__'. Did you mean: '__ne__'?

I can work around this by adding a __name__ attribute, but it'd be great if taskgraph could fall back to a default name if the name attribute didn't exist.