add dataset_info in dataset metadata

fix task_ids

Add `language_bcp47` tag (#4753)

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

Update files from the datasets library (from 1.18.0)

Update files from the datasets library (from 1.9.0)

Update files from the datasets library (from 1.7.0)

Update files from the datasets library (from 1.4.0)