[Feature] Support W8A16 Int8 inside FusedMoE

[halexan]

Checklist

• 1. If the issue you raised is not a feature but a question, please raise a discussion at https://github.com/sgl-project/sglang/discussions/new/choose Otherwise, it will be closed.
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Motivation

vllm now supports W8A16 Int8 inside FusedMoE. see #7415

So, after vllm new version released. sglang will support too?

Related resources

No response

[zhyncs]

In the short term, yes. In the long term, we will maintain it ourselves.