Expose request body for all steps in generateText

[williamlmao]

Feature Description

Expose request body for all steps in generateText

Currently you can access the request body per request by intercepting the fetch or using middleware, but neither of these methods give you access to variables in the calling function scope.

It would be useful to access the request bodies of every step called.

Use Case

Logging / saving request body data along with additional data from the calling function scope.

Additional context

No response