bump version 0.4.7 -> 0.4.8

[belerico]

Summary

Release v0.4.8. In particular:

• Moved configs parameters (cnn_keys/decoder_keys, per_rank_batch_size, per_rank_sequence_length, total_steps and more) to the algo config
• Added the integration of MLFlow logger from pytorch-lightning (https://lightning.ai/docs/pytorch/stable/api/lightning.pytorch.loggers.mlflow.html)

Type of Change

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• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist

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• [x] I have tested my changes locally and they work as expected. (Please describe the tests you performed.)
• [x] I have added unit tests for my changes, or updated existing tests if necessary.
• [x] I have updated the documentation, if applicable.
• [x] I have installed pre-commit and run locally for my code changes.

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