A unified API for the MNNVL and single-node AllReduce kernels.

[nvmbreughe]

📌 Description

A unified API for the MNNVL and single-node AllReduce kernels.

The backend will be chosen during workspace creation. We can either pick it explicitly, or use the "auto" backend to have a heuristic pick the best backend.

🔍 Related Issues

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[yzh119]

Suggested change

	topology: str,
	topology: Literal["single_node", "multi_node"],