Delete legacy JSON metadata

Replace YAML keys from int to str (#2)

Reorder split names (#1)

add dataset_info in dataset metadata

remove dummmy data

Align more metadata with other repo types (models,spaces) (#4607)

Eval metadata batch 2 : Health Fact, Jigsaw Toxicity, LIAR, LJ Speech, MSRA NER, Multi News, NCBI Disease, Poem Sentiment (#4336)

Update files from the datasets library (from 1.18.0)

Update files from the datasets library (from 1.7.0)

Update files from the datasets library (from 1.6.0)

Update files from the datasets library (from 1.3.0)

Update files from the datasets library (from 1.2.0)