

TITLE
Add classes for Multi-label classification models? 

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# 🚀 Feature request

It would be nice to add classes for Multi-label classification models to the library.

## Motivation

In my projects, I need to perform Multi-label classification. This problem setting is quite common in real-life modelling. 

## Your contribution

As there isn't a class implemented for this in the library, I have implemented my own. I have modified, for example, BertForSequenceClassificationton to make it usable for multi-label modelling. Then, I train the model with the Trainer class as usual.

Is there any interest or plan to add this from the library maintainers? If so, I would be happy to collaborate or start working on a PR.

Thanks
