serializer: add `deserialize` function overload for `bytes_ostream`
serializer: add `deserialize` function overload for `bytes_ostream`

For some reason we had a distinct specialization of `serialize`
function to handle `bytes_ostream` but not `deserialize`.

This will be used in the following patches.

Signed-off-by: Pavel Solodovnikov <2cf5887fafb117b7ff3e29b9720a7305c3313494@scylladb.com>

scylladb/scylla,scylladb/scylla,scylladb/scylla,scylladb/scylla