Adding a dataset with multiple subtasks
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For one dataset you can have different configurations that each have their own `nlp.Features`.
We imagine having one configuration per subtask for example.
They are loaded with `nlp.load_dataset("my_dataset", "my_config")`.

For example the `glue` dataset has many configurations. It is a bit different from your case though because each configuration is a dataset by itself (sst2, mnli).
Another example is `wikipedia` that has one configuration per language.
I intent to add the datasets of the MT Quality Estimation shared tasks to `nlp`. However, they have different subtasks -- such as word-level, sentence-level and document-level quality estimation, each of which having different language pairs, and some of the data reused in different subtasks.

For example, in [QE 2019,](http://www.statmt.org/wmt19/qe-task.html) we had the same English-Russian and English-German data for word-level and sentence-level QE. 

I suppose these datasets could have both their word and sentence-level labels inside `nlp.Features`; but what about other subtasks? Should they be considered a different dataset altogether?

I read the discussion on #217 but the case of QE seems a lot simpler.
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