Transformers-lightning

- Added `CompressedDataModule` based on `CompressedDataset`

- Added `CompressedDataset` based on [`CompressedDictionary`](https://github.com/lucadiliello/compressed-dictionary)

- Removed `IterableDataset`

- Metrics has been moved to the `torchmetrics` library ([81](https://github.com/iKernels/transformers-lightning/issues/81))

- Removed losses package because it has been empty for months.

- Language models do not modify `inputs` anymore ([74](https://github.com/iKernels/transformers-lightning/pull/75))

- All `Language Models` have now a generic `probability` parameter (signature of all language models has been updated).

- Improved efficiency of `ElectraAdamW`.