[Feature] Add SageMaker Support

[andjsmi]

Checklist

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Motivation

Hi.

SageMaker Endpoints will listen for invocations at /invocations and for health checks at /health (ref). On modifying the server to listen on these endpoints, sglang can be used for SageMaker endpoints for hosting models. Is it possible to add support for this?

Thanks

Related resources

No response

[andjsmi]

Created a PR: #3740

[zhaochenyang20]

Thanks!

[zhaochenyang20]

@andjsmi Please refer to the PR.