Add basic instruct questions

[wongjingping]

• Add basic instruct questions
• Upgrade openai's runner and standard prompt generator to bypass pruning when num_columns = 0

sample test runs with openai on these data:

$ python main.py \
  -db postgres \
  -q data/instruct_basic_postgres.csv \
  -o results/openai_gpt4_turbo_basic.csv \
  -g oa \
  -f prompts/prompt_openai.md \
  -m gpt-4-0125-preview \
  -c 0 \
  -p 20
/Users/jp/workspace/miniconda3/lib/python3.11/site-packages/torch/_utils.py:831: UserWarning: TypedStorage is deprecated. It will be removed in the future and UntypedStorage will be the only storage class. This should only matter to you if you are using storages directly.  To access UntypedStorage directly, use tensor.untyped_storage() instead of tensor.storage()
  return self.fget.__get__(instance, owner)()
Preparing questions...
Using all questions from data/instruct_basic_postgres.csv
Correct so far: 38/40 (95.00%): 100%|██████████████████████████| 40/40 [00:16<00:00,  2.38it/s]
                      query_category  num_rows  mean_correct  mean_error_db_exec
0            basic_group_order_limit         8          1.00                 0.0
1  basic_join_date_group_order_limit         8          1.00                 0.0
2                basic_join_distinct         8          1.00                 0.0
3       basic_join_group_order_limit         8          0.75                 0.0
4                    basic_left_join         8          1.00                 0.0
Average correct rate: 0.95

[rishsriv]

Looks great! c=0 is super useful. Thank you!

[rishsriv]

Just need to do a quick fix for the failing tests, then good to merge!