Treat std::vector<char> similar to rfl::Bytestring #459
Description
I am using msgpack in an RPC library to serialize structs with reflect-cpp and have a situation where msgpack messages are nested, i.e. a std::vector<char> is produced by a rfl::msgpack::write which is then added to a struct and serialized again before sending it over a connection. To my understanding, the vector is not treated in a special way, and would be serialized element by element. It would be nice if reflect-cpp can treat std::vector<char> similar to rfl::Bytestring; today, I have to do a vector copy to convert between the two and benefit from the serializer's optimizations.