[Feature]: [V1] Collective RPC

[robertgshaw2-redhat]

🚀 The feature, motivation and pitch

We currently do not support collective rpc on V1. It would be great if someone could implement this!

See tests/entrypoints/llm/test_collective_rpc.py

Alternatives

No response

Additional context

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[wwl2755]

I think it is quite relevant to the PR #15367 ? I would like to take a deeper look at it.