feat(langchain/createAgent): Add support for callOptions to middleware

[pokey]

This allows us to pass things like headers and container to the model call

• Needed by feat(langchain/createAgent): Add anthropicCodeExecution middleware pokey/langchainjs#1

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[christian-bromann]

LGTM 👍

Let's sync with the Python team on the new property on ModelRequest

[pokey]

As discussed with @eyurtsev, we're holding off on merging this one until we look into Python version

[eyurtsev]

cc @christian-bromann / @pokey is this a standard name in js?

@sydney-runkle this is extra config that we'll be passing to chat model invoke. We can either use the same standard name if it makes sense or follow whatever is convention in each language.

• extra_params
• invoke_kwargs

[christian-bromann]

to be more specific here I would suggest modelCallOptions as an alternative.