Options for preferring hanging indents with one item per line when formating lists

I would like to add options/code so that yapf can be configured to prefer outputting something like

```
MyLongNamedTuple = (
something.somethingelse,
something.somethingelse,
foo=(
bar.somethingelse,
something.asdfas,
),
)
```

over

```
MyLongNamedTuple = ( something.somethingelse,
something.somethingelse, foo=( bar.somethingelse,
something.asdfas),)
```

The issue names no files, tests, or entry points. Reproduce the two formatting examples with YAPF, then trace the formatter's option handling and list-formatting behavior; done means a documented configuration produces the requested one-item-per-line hanging-indent output without breaking the nested example.

Written by the indexing model from the issue text.