Add the original `LAMBADA` dataset

tests/testdata/lambada_openai_mt_it-v0-loglikelihood

+fd87c6c5cf4e0499c5f9f80e5bd7ee6a4f3d2991902a0cc3ec9e6eaf22d6760a
\ No newline at end of file

tests/testdata/lambada_openai_mt_it-v0-res.json

+{"results": {"lambada_openai_mt_it": {"acc": 0.0, "acc_stderr": 0.0, "ppl": 1.6479047769869253, "ppl_stderr": 0.006497321146240192}}, "versions": {"lambada_openai_mt_it": 0}}
\ No newline at end of file

tests/testdata/lambada_standard-v0-loglikelihood

+8958d9f8d8145046b692fadd8a9cc9c8bad5617c10774280cf7c24c21d2be160
\ No newline at end of file

tests/testdata/lambada_standard-v0-res.json

+{"results": {"lambada_standard": {"acc": 0.0, "acc_stderr": 0.0, "ppl": 1.6479047769869253, "ppl_stderr": 0.006497321146240192}}, "versions": {"lambada_standard": 0}}
\ No newline at end of file

tests/testdata/lambada_standard_cloze-v0-loglikelihood

+b604f00bc9f2a77ef41f8cfdb5a8509b3ae9266893b9e90abc665f5399ecba4e
\ No newline at end of file

tests/testdata/lambada_standard_cloze-v0-res.json

+{"results": {"lambada_standard_cloze": {"acc": 0.0, "acc_stderr": 0.0, "ppl": 1.6479047769869253, "ppl_stderr": 0.006497321146240192}}, "versions": {"lambada_standard_cloze": 0}}
\ No newline at end of file