Feat/ArAIEval23 tasks data

[firojalam]

• We need to upload the dataset for download. The are currently on the main server location 'data_for_download'
• The datasets comes with four different task definitions, (task 1 with binary and multilabel, and task 2 with binary and multiclass). Not sure how to organize them. Keeping them separate might be a good idea for post processing and other purposes but then it creates many dataset files.