Remap the full error to RdkafkaError instead of int

[mensfeld]

At the moment we use only the int representation of errors. This however is limited and does not allow us to operate on error metadata like information if the error is retryable.

It would be good to handle all errors in the same way, that is build them based on full scope of information provided by rd_kafka_error_t.

[mensfeld]

All errors from err_cb are with code, hence they can be remapped automatically but we need a way to get error, extract metadata and remove c error.