Added hooks to RL

[mydatascience]

Description

Added hooks for metrics and data inpiut to RL/GRPO

Tests

Run on my TPU

Checklist

Before submitting this PR, please make sure (put X in square brackets):

• I have performed a self-review of my code. For an optional AI review, add the gemini-review label.
• I have necessary comments in my code, particularly in hard-to-understand areas.
• I have run end-to-end tests tests and provided workload links above if applicable.
• I have made or will make corresponding changes to the doc if needed.

[github-actions]

🤖 Hi @mydatascience, I've received your request, and I'm working on it now! You can track my progress in the logs for more details.