parlio_rx_unit_wait_all_done() function

- ESP_ERR_INVALID_ARG The input rx_unit is NULL - ESP_ERR_TIMEOUT Wait for all transactions done timeout - ESP_OK All transaction done

This function will block until all receiving transactions done or timeout. When timeout occurs, either the timeout limitation too short for all transactions done, or the peripheral got stuck and no more interrupts trigger (e.g., external clock stopped).