Add style for multiline comprehensions

If a comprehension can’t fit on one line, splitting it to multiple lines on comprehension specific things would be good.

foo = [
    some_func(value)
    for value in a_long_named_iterable
    if some_condition(value)
    and not bad_thing(value)
]

Right now it’s collecting the for .. in .. if all in one line rather than splitting them

[tilgovi]

I think this issue is still open. It sounds like #470 addressed where to split a long comprehension but does not allow forcing a complex comprehension to be split regardless of length.

[rgangopadhya]

👍 on this. Perhaps a knob for favoring shorter lines up to some limit would help. Or a knob simply enforcing that comprehensions are always split.