Update arabic_evals.py
Add new Arabic benchmarks and update existing tasks
- Renamed `arabic_mmlu` to `arabic_mmlu_mt` to highlight its machine-translated origin.
- Added new benchmarks: `arabic_mmlu` ArabicMMLU (https://arxiv.org/abs/2402.12840), `arabic_mmlu_ht` (human-translated), and `MadinahQA` from MBZUAI. As well as `arabic_mmmlu` (OpenAI MMMLU), and `AraTrust` a trustworthiness benchmark for Arabic LLMs (https://arxiv.org/abs/2403.09017).
- Enhanced prompt functions for better flexibility in answer options.
