Delete legacy JSON metadata

Delete legacy `dataset_infos.json`.

dataset_infos.json

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-{"default": {"description": "     \nThis corpus contains a large metadata-rich collection of fictional conversations extracted from raw movie scripts:\n- 220,579 conversational exchanges between 10,292 pairs of movie characters\n- involves 9,035 characters from 617 movies\n- in total 304,713 utterances\n- movie metadata included:\n    - genres\n    - release year\n    - IMDB rating\n    - number of IMDB votes\n    - IMDB rating\n- character metadata included:\n    - gender (for 3,774 characters)\n    - position on movie credits (3,321 characters)\n", "citation": "  @InProceedings{Danescu-Niculescu-Mizil+Lee:11a,\n\n  author={Cristian Danescu-Niculescu-Mizil and Lillian Lee},\n\n  title={Chameleons in imagined conversations: \n  A new approach to understanding coordination of linguistic style in dialogs.},\n\n  booktitle={Proceedings of the \n\n        Workshop on Cognitive Modeling and Computational Linguistics, ACL 2011},\n\n  year={2011}\n\n}\n", "homepage": "http://www.cs.cornell.edu/~cristian/Cornell_Movie-Dialogs_Corpus.html", "license": "", "features": {"movieID": {"dtype": "string", "id": null, "_type": "Value"}, "movieTitle": {"dtype": "string", "id": null, "_type": "Value"}, "movieYear": {"dtype": "string", "id": null, "_type": "Value"}, "movieIMDBRating": {"dtype": "string", "id": null, "_type": "Value"}, "movieNoIMDBVotes": {"dtype": "string", "id": null, "_type": "Value"}, "movieGenres": {"feature": {"dtype": "string", "id": null, "_type": "Value"}, "length": -1, "id": null, "_type": "Sequence"}, "characterID1": {"dtype": "string", "id": null, "_type": "Value"}, "characterID2": {"dtype": "string", "id": null, "_type": "Value"}, "characterName1": {"dtype": "string", "id": null, "_type": "Value"}, "characterName2": {"dtype": "string", "id": null, "_type": "Value"}, "utterance": {"feature": {"text": {"dtype": "string", "id": null, "_type": "Value"}, "LineID": {"dtype": "string", "id": null, "_type": "Value"}}, "length": -1, "id": null, "_type": "Sequence"}}, "supervised_keys": null, "builder_name": "cornell_movie_dialog", "config_name": "default", "version": {"version_str": "0.1.0", "description": null, "datasets_version_to_prepare": null, "major": 0, "minor": 1, "patch": 0}, "splits": {"train": {"name": "train", "num_bytes": 19548840, "num_examples": 83097, "dataset_name": "cornell_movie_dialog"}}, "download_checksums": {"https://www.cs.cornell.edu/~cristian/data/cornell_movie_dialogs_corpus.zip": {"num_bytes": 9916637, "checksum": "3bde8a571f615201bc2d2453e22878090719638592f774720eddec739de8c900"}}, "download_size": 9916637, "dataset_size": 19548840, "size_in_bytes": 29465477}}