log rank zero everywhere

Context

Are you tired of constantly checking for rank zero before logging? Then log_rank_zero is just the solution for you!

Changelog

What are the changes made in this PR?

Remove pesky if statements checking for rank zero before logging and instead use log_rank_zero
add stacklevel=2 to log_rank_zero so the line from the calling function is shown instead of within log_rank_zero. This is not yet relevant, until we decided to show more details on where the log was emitted by configuring the logger format more, but this can improve UX internally

Test plan

Please make sure to do each of the following if applicable to your PR. If you're unsure about any one of these just ask and we will happily help. We also have a contributing page for some guidance on contributing.

[ ] run pre-commit hooks and linters (make sure you've first installed via pre-commit install)
[ ] add unit tests for any new functionality
[ ] update docstrings for any new or updated methods or classes
[ ] run unit tests via pytest tests
[ ] run recipe tests via pytest tests -m integration_test
[ ] manually run any new or modified recipes with sufficient proof of correctness
[ ] include relevant commands and any other artifacts in this summary (pastes of loss curves, eval results, etc.)

UX

If your function changed a public API, please add a dummy example of what the user experience will look like when calling it. Here is a docstring example and a tutorial example

[ ] I did not change any public API
[ ] I have added an example to docs or docstrings

:link: Helpful Links

:test_tube: See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/torchtune/2030

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As of commit 99fe27b7cc8c75210e6e119c81e816b48f9f97e2 with merge base abdb5a43c1173cdb05208ca6fd498919536c4c19 (): :green_heart: Looks good so far! There are no failures yet. :green_heart:

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pytorch / torchtune