[FIX] Save speed metrics to logs
Author: pavelgein
Pull request: yes

Previously, we calculated speed metrics and did not do anything with the result.

# What does this PR do?

Save speed metrics to logs.

Fixes # (issue)


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Comments:
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> Thanks ! Can you share the logs that you get just to check if this is working ?

Unfortunately, I don't have console logs right now, but can show plots from [ClearML](https://clear.ml/) interface 
<img width="502" alt="image" src="https://github.com/user-attachments/assets/4dee771e-f19d-47b6-b7d8-91d8f54f2e6c" />


Got console logs, 
```
{'loss': 16.8527, 'grad_norm': 443.156198877649, 'learning_rate': 0.0, 'epoch': 0.33, 'num_input_tokens_seen': 16, 'train_runtime': 12.9532, 'train_tokens_per_second': 1.235}
```

The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/transformers/pr_38136). All of your documentation changes will be reflected on that endpoint. The docs are available until 30 days after the last update.

Awesome thanks !