wireprotov2: establish dedicated classes for input and output streams
Streams are unidirectional. As part of implementing encoding/decoding
support, it became clear that it didn't make sense for a generic
"stream" class to hold functionality related to both encoding and
decoding. So we create new classes to represent the flavor of
stream.
Differential Revision: https://phab.mercurial-scm.org/D4920
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