Make inspect.get_dataset_config_names always return a non-empty list
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This PR is already working (although not very beautiful; see below): the idea was to have the `DatasetModule.builder_kwargs` accessible from the `builder_cls`, so that this can generate the default builder config (at the class level, without requiring the builder to be instantiated).

I have a plan for a follow-up refactoring (same functionality, better implementation, much nicer), but I think we could already merge this, so that @severo can test it in the datasets previewer and report any potential issues.
2021-10-26T13:57:28Z
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2021-10-26T14:06:35Z
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Yes @lhoestq you are completely right. Indeed I was exclusively using `builder_cls.kwargs` to get the community dataset `name` (nothing else): "lhoestq___demo1"

See et: https://github.com/huggingface/datasets/pull/3159/files#diff-f933ce41f71c6c0d1ce658e27de62cbe0b45d777e9e68056dd012ac3eb9324f7R413-R415

In your example, the `name` I was getting from `builder_cls.kwargs` was:
```python
{"name": "lhoestq___demo1",...}
```

I'm going to refactor all the approach... as I only need the name for this specific case ;)
2021-10-26T15:06:00Z
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2021-10-27T15:02:20Z
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I think this makes more sense now, @lhoestq @severo 😅 
2021-10-27T15:01:48Z
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It works well, thanks!
2021-10-29T13:14:36Z
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Make all named configs cases, so that no special unnamed config case needs to be handled differently.

Fix #3135.