[Haskell-cafe] Add newtype for Alternative using QuantifiedConstraints in base-4.13

[Ruben Astudillo]

I wonder if it is useful at all. If `f a` already has a Monoid instance,
you can use `(<>)` already instead of (<|>) with pretty much the same
laws. Plus you don't have to import `(<>)` as it comes from the Prelude
where `(<|>)` doesn't. Does this have an use case or is just for
aesthetic completeness?

-- 
-- Ruben
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