Proposal: pare down traversable

[David Feuer]

Traversable currently has traverse, sequenceA, sequence, and mapM methods.
sequence and mapM seem to be dinosaurs now. I'd like to suggest that
sequenceA be turned into a deprecated function and mapM be moved from
Control.Monad to Data.Traversable and re-exported from Control.Monad.

I expect most instance declarations to survive unchanged. The only CPP pain
point will be that instances that define sequenceA will have to define
sequence instead.
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