feat: add blimp_it italian grammar evaluation tasks

[cristianochesi]

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[cristianochesi]

any chance to get the merge of the BLiMP-IT reviewed by end of the month?

[baberabb]

Thanks for the PR! A couple of blockers though, and I think both point at the tasks not having been run end-to-end yet:

1. _template_yaml sets validation_split: train, but NeTSlab/BLiMP-IT only has a test split.
2. 27 task YAMLs reference dataset_names with no matching HF configs. the same 27 not listed in _blimp_it.yaml. They look like superseded duplicates (conversa_a_agreement_in_dp vs conversa_a_agreement_dp, etc.). Should those be deleted, or are the configs still to be uploaded?
3. Can you add a row to lm_eval/tasks/README.md, with a short description as all the other tasks.

Can you do a --limit 10 run on any small model once the split is fixed? That'll confirm it end-to-end

[cristianochesi]

Thanks for the check! I fixed all the issues you mentioned and also grouped the phenomena to improve the readability of the results. I confirmed with a small test (lm_eval --model hf --model_args pretrained=GroNLP/gpt2-small-italian --tasks blimp_it --limit 10 --device cpu --batch_size 8) that everything runs smoothly now.