GitLab

* add mmlu tasks from pile-t5

* Update _mmlu_flan_cot_fewshot_template_yaml

* Update _mmlu_flan_cot_zeroshot_template_yaml

* Update _mmlu_flan_generative_template_yaml

* Update _mmlu_flan_loglikelihood_template_yaml

* Update _default_template_yaml

---------
Co-authored-by: Hailey Schoelkopf <65563625+haileyschoelkopf@users.noreply.github.com>