add post process & result calculus

modules/evaluators/graph_builder_llm_eval.py

modules/evaluators/llm_annotation_evaluator.py

modules/evaluators/llm_output_cleaner.py

modules/llm/Mixtral-8x7b/Mixtral-8x7b_zero_shot.py

modules/llm/utils.py

results/GPT-4/GPT-4_zero_shot_results.json

results/Mistral-7b/MISTRAL_zero_shot_cleaned.json

results/Mistral-7b/MISTRAL_zero_shot_results.json

results/Mixtral-8x7b/MIXTRAL_zero_shot_cleaned.json

results/Mixtral-8x7b/MIXTRAL_zero_shot_results.json