[Feature] WebSockets implementation of ChatTransport

Description

I am looking for this, basically:

https://github.com/vercel/ai/pull/9559

It is probably outdated by now - sadly, it was just left there and no one ever even commented.

I'm building an agent that needs to do potentially many client-side tool calls, and the default SSE transport is going to suck for this - it's going to "stop the world" on every tool call, and add unreasonable HTTP overhead (and much slower requests) for a single end user chat request.

I looked everywhere and can't find a package that does this, which is frustrating - I could take that draft and try to update it and complete it (not sure how finished it is) but it's more than I'm willing to own. I could let my agent hammer something out, and it would probably work, but I'm not an expert at either AI SDK or WebSockets, so I wouldn't trust it in a work setting.

Vercel's own docs for ChatTransport actually state:

This is particularly useful for alternative communication protocols like WebSockets

It really would be.

Any chance you could take a look at the work that's already been done here?

Reproduction

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AI SDK Version

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