wireproto: split streamres into legacy and modern case
A couple of commands currently require transmission of uncompressed
frames with the old MIME type. Split this case from streamres into
a new streamres_legacy class. Streamline the remaining code accordingly.
Add a new flag to streamres to request uncompressed streams. This is
useful for sending data that is already compressed like a pre-built
bundle. Expect clients to support uncompressed data. For older clients,
zlib will still be used.
Differential Revision: https://phab.mercurial-scm.org/D1862
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