Having a ginormous error enum returned for this method means that
the catch-all behaviour gets leaked into the error naming and
semantics of callers. The decoder is a new type and could benefit from
not adding to the existing error enum.
This adds a new crate with a type capable of converting
decoded WAL Write Op entries to line protocol and writing
the result to a namespaced destination. The wal crate
now exports a type which reads the sequenced wal ops and
decodes them as namespaced table batch writes.
Fraser Savage