Refactor yield per config

Refactor

Use context managers for reading files

Refactor dict literals, docstring and download splits

Fix FileNotFoundError for alt-en and alt-jp configs (#8)

Fix issue about couldn't cast array (#4)

Update files from the datasets library (from 1.6.0)

Update files from the datasets library (from 1.5.0)

Update files from the datasets library (from 1.4.0)

Update files from the datasets library (from 1.2.0)