Request for text deduplication feature
### Feature request

It would be great if there would be support for high performance, highly scalable text deduplication algorithms as part of the datasets library.

### Motivation

Motivated by this blog post https://huggingface.co/blog/dedup and this library https://github.com/google-research/deduplicate-text-datasets, but slightly frustrated by how its not very easy to work with these tools I am proposing this feature.

### Your contribution

I would be happy to contribute to the development effort of this feature. would love to collaborate with others in the development effort. 