Add .streamEvents support to RemoteRunnables

[vedmakk]

Checked

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• I've clearly described the feature request and motivation for it

Feature request

Similar to how Runnables already supports streamEvents, the RemoteRunnables should support it as well.

Motivation

When you have a LangServe Server running with an AgentExecutor and you need more fine-grained streaming than what you get from the /stream endpoint (where you would only get intermediate steps answers streamed, not tokens), but at the same time you don't need the full details that streamLog offers (hard to parse), then it would be great to have streamEvents available for RemoteRunnables.

Proposal (If applicable)

No response

[jacoblee93]

Yes this has been on the TODO list for a while - will try to get to it next week.