Add siqa and csqa tasks

[yulinggu-cs]

Add Social IQA and Commonsense QA tasks.

Test from running: PYTHONPATH="/Users/yulingg/My_Git_Repositories/catwalk" python llm_eval/run_lm_eval.py --model lm::pretrained=EleutherAI/pythia-160m,revision=step140000 --task social_iqa csqa --split validation --full_output_file predictions.jsonl --metrics_file metrics.json --model_max_length 2048 --limit 10 --max_batch_tokens 4096 --num_recorded_inputs 3 --num_shots 0:

... 'correct_choice': 1, 'unconditioned_input': [('Answer:', ' cheating'), ('Answer:', ' a bad child'), ('Answer:', ' interested in making money')], 
'metrics': {'acc_raw': 0, 'predicted_index_raw': 0, 'acc_per_token': 0, 'predicted_index_per_token': 2, 'acc_per_char': 0, 'predicted_index_per_char': 2, 'acc_uncond': 0, 'predicted_index_uncond': 2, 'probability_mass': 2.3027600944029188e-07, 'acc': 0}}, 
'model_input': [('Question: Lee sold things belonging to her mom without her permission. How would Lee feel afterwards?\nAnswer:', 
' cheating'),
 ('Question: Lee sold things belonging to her mom without her permission. How would Lee feel afterwards?\nAnswer:', 
' a bad child'),
 ('Question: Lee sold things belonging to her mom without her permission. How would Lee feel afterwards?\nAnswer:', 
' interested in making money')]} 
...
 'correct_choice': 2, 'unconditioned_input': [('Answer:', ' hospital'), ('Answer:', ' park'), ('Answer:', ' corner'), ('Answer:', ' motel'), ('Answer:', ' office')], 
'metrics': {'acc_raw': 0, 'predicted_index_raw': 1, 'acc_per_token': 0, 'predicted_index_per_token': 1, 'acc_per_char': 0, 'predicted_index_per_char': 0, 'acc_uncond': 0, 'predicted_index_uncond': 1, 'probability_mass': 9.05275873202387e-06, 'acc': 0}},
 'model_input': [('Question: Many towns and cities have trash cans where on sidewalks?\nAnswer:', 
' hospital'),  ('Question: Many towns and cities have trash cans where on sidewalks?\nAnswer:', 
' park'), ('Question: Many towns and cities have trash cans where on sidewalks?\nAnswer:', 
' corner'), ('Question: Many towns and cities have trash cans where on sidewalks?\nAnswer:', 
' motel'), ('Question: Many towns and cities have trash cans where on sidewalks?\nAnswer:', 
' office')]} 

[OyvindTafjord]

Thanks, LGTM!