Adds a FlyteCallback (#23759)
* initial flyte callback
* lint
* logs should still be saved to Flyte even if pandas isn't install (unlikely)
* cr - flyte team
* add docs for Flytecallback
* fix doc string - cr sgugger
* Apply suggestions from code review
cr - sgugger fix doc strings
Co-authored-by: Sylvain Gugger <35901082+sgugger@users.noreply.github.com>
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Co-authored-by: Sylvain Gugger <35901082+sgugger@users.noreply.github.com>
