AraDICE task config file

[firojalam]

The AraDICE task and associated config files are based on the following paper.
https://arxiv.org/abs/2409.11404

[CLAassistant]

All committers have signed the CLA.

[firojalam]

@baberabb @lintangsutawika,
Can you please consider merging the pull request?

Thanks

[baberabb]

@firojalam LGTM! One last thing: could you add an entry to lm_eval/tasks/README.md explaining the task in one sentence like all the other tasks? Thanks!

[firojalam]

@baberabb, thanks.
Added task information as advised.

[baberabb]

For multiple-choice tasks the default prompt format is <doc_to_text><target_delimiter><doc_to_choice> for each choice in doc_to_choice, where the default target_delimiter=" "
Some tasks failing a check where doc_to_choice starts with a space and target delimiter is also a space. Just wanted to confirm if that is the your expected format.