Method get_bson_binary

Source/external/json.hpp:9319–9334

	*/
	template<typename NumberType>
	bool get_bson_binary(const NumberType len, binary_t& result)
	{
		if (JSON_HEDLEY_UNLIKELY(len < 0))
		{
			auto last_token = get_token_string();
			return sax->parse_error(chars_read, last_token, parse_error::create(112, chars_read,
									exception_message(input_format_t::bson, concat("byte array length cannot be negative, is ", std::to_string(len)), "binary"), nullptr));
		}

		// All BSON binary values have a subtype
		std::uint8_t subtype{};
		get_number<std::uint8_t>(input_format_t::bson, subtype);
		result.set_subtype(subtype);

		return get_binary(input_format_t::bson, len, result);
	}

	/*!
	@brief Read a BSON document element of the given @a element_type.