Add support to create different configs with `push_to_hub` (+ inferring configs from directories with package managers?)
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also asked in https://discuss.huggingface.co/t/create-multiple-dataset-configs-with-push-to-hub-method/25480
Now one can push only different splits within one default config of a dataset.

Would be nice to allow something like:
```
ds.push_to_hub(repo_name, config=config_name)
```

I'm not sure, but this will probably require changes in `data_files.py` patterns. If so, it would also allow to create different configs for packaged modules datasets. 

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