Function basic_json from_msgpack

extern/json/json.hpp:23609–23619

    /// @sa https://json.nlohmann.me/api/basic_json/from_msgpack/
    template<typename InputType>
    JSON_HEDLEY_WARN_UNUSED_RESULT
    static basic_json from_msgpack(InputType&& i,
                                   const bool strict = true,
                                   const bool allow_exceptions = true)
    {
        basic_json result;
        detail::json_sax_dom_parser<basic_json> sdp(result, allow_exceptions);
        auto ia = detail::input_adapter(std::forward<InputType>(i));
        const bool res = binary_reader<decltype(ia)>(std::move(ia), input_format_t::msgpack).sax_parse(input_format_t::msgpack, &sdp, strict);
        return res ? result : basic_json(value_t::discarded);
    }

    /// @brief create a JSON value from an input in MessagePack format
    /// @sa https://json.nlohmann.me/api/basic_json/from_msgpack/