Allows mixing data_output with other output stream like
seastar::simple_output_stream which is useful when switching to the new
IDL-based serializers.
Signed-off-by: Paweł Dziepak <pdziepak@scylladb.com>
bytes and sstring are distinct types, since their internal buffers are of
different length, but bytes_view is an alias of sstring_view, which makes
it possible of objects of different types to leak across the abstraction
boundary.
Fix this by making bytes a basic_sstring<int8_t, ...> instead of using char.
int8_t is a 'signed char', which is a distinct type from char, so now
bytes_view is a distinct type from sstring_view.
uint8_t would have been an even better choice, but that diverges from Origin
and would have required an audit.
