Adding (??) into Data.Functor

[Dimitri Sabadie]

Hi all,

I often come up using this snippet:
map ($ a) l
with
l :: [a -> b]

In Control.Lens, there's a nice combinator for that, (??) :

l ?? a

I think it'd be great to include that in Data.Functor, because it's a very
common use case.
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