Trackio when available (#930)
* use trackio when available
* Update src/lighteval/logging/evaluation_tracker.py
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
* update doc
* change attr name
* fix trackio typo
* Update docs/source/saving-and-reading-results.mdx
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
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Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>