Make inspect.get_dataset_config_names always return a non-empty list of configs

[severo]

Is your feature request related to a problem? Please describe.

Currently, some datasets have a configuration, while others don't. It would be simpler for the user to always have configuration names to refer to

Describe the solution you'd like

In that sense inspect.get_dataset_config_names should always return at least one configuration name, be it default or Check___region_1 (for community datasets like Check/region_1).

datasets/src/datasets/inspect.py

Line 161 in c5747a5

def get_dataset_config_names(

[albertvillanova]

Hi @severo, I guess this issue requests not only to be able to access the configuration name (by using inspect.get_dataset_config_names), but the configuration itself as well (I mean you use the name to get the configuration afterwards, maybe using builder_cls.builder_configs), is this right?

[severo]

Yes, maybe the issue could be reformulated. As a user, I want to avoid having to manage special cases:

• I want to be able to get the names of a dataset's configs, and use them in the rest of the API (get the data, get the split names, etc).
• I don't want to have to manage datasets with named configs (glue) differently from datasets without named configs (acronym_identification, Check/region_1)