let tunix see lr hyperparams for logging

[andytwigg]

Description

use optax hyperparam inject wrapper to let tunix see lr hyperparams for logging

Tests

ran and observed that tunix was logging LR correctly.

Checklist

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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[A9isha]

Thanks Andy!

[richjames0]

lgtm