Adding more instances to Kleisli: Generic, Monad, etc

[Fumiaki Kinoshita]

This is another part of
https://gitlab.haskell.org/ghc/ghc/merge_requests/644, which is presumably
much less controversial:

Generic (Kleisli m a b)
Functor m => Functor (Kleisli m a)
Applicative m => Applicative (Kleisli m a)
Alternative m => Alternative (Kleisli m a)
Monad m => Monad (Kleisli m a)
(Alternative m, Monad m) => MonadPlus (Kleisli m a)
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