Making Data.Function.& levity polymorphic

Mirroring (Data.Function.$) I think (Data.Function.&) ought to be levity polymorphic as well

($) :: forall (rep :: RuntimeRep) (a :: Type) (b :: TYPE rep). (a -> b) -> a -> b
(&) :: forall (rep :: RuntimeRep) (a :: Type) (b :: TYPE rep). a -> (a -> b) -> b
f $ a = f a
a & f = f a

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