add evaluate script for t5/(nlu|dst)/*.sh

convlab2/base_models/t5/dst/run_multiwoz21.sh

convlab2/base_models/t5/nlu/run_multiwoz21_user.sh

convlab2/base_models/t5/nlu/run_multiwoz21_user_context3.sh

convlab2/base_models/t5/nlu/run_tm1_user.sh

convlab2/base_models/t5/nlu/run_tm1_user_context3.sh

convlab2/base_models/t5/nlu/run_tm2_user.sh

convlab2/base_models/t5/nlu/run_tm2_user_context3.sh

convlab2/base_models/t5/nlu/run_tm3_user.sh

convlab2/base_models/t5/nlu/run_tm3_user_context3.sh