Add kuberay/trainium llama training example - DRAFT

[5cp]

What does this PR do?

Adds an example of kuberay/trainium multi-node training for llama2-7B using recently merged support for trainium/trn1 in Ray.

Motivation

Example is functional but likely needs some polishing. Vara suggested I submit as-is so we can collaborate on it.

More

• Yes, I have tested the PR using my local account setup (Provide any test evidence report under Additional Notes)
• Mandatory for new blueprints. Yes, I have added a example to support my blueprint PR
• Mandatory for new blueprints. Yes, I have updated the website/docs or website/blog section for this feature
• Yes, I ran pre-commit run -a with this PR. Link for installing pre-commit locally

For Moderators

• E2E Test successfully complete before merge?

Additional Notes